Exterior wall cleaning method

Abstract

This invention provides a building exterior wall cleaning technology that allows for application of the detergent to a degree that prevents it from running off, regardless of the condition of the exterior wall, and that effectively lifts dirt from the exterior wall while using the minimum necessary amount of detergent. [Solution] A method for cleaning the exterior wall of a building using a brush capable of dispensing detergent and water, comprising a detergent application step of spraying detergent and a rinsing step of washing with water, wherein in the detergent application step the exterior wall is divided into multiple areas in the vertical direction and the detergent is applied in order from the lower area to the upper area, and in the rinsing step water is sprayed from the top to the bottom of the exterior wall to rinse.

Description

[Technical Field]

[0001] The present invention relates to a method for cleaning outer walls, and more particularly to a technique for applying a detergent in outer wall cleaning of buildings. [Background Art]

[0002] Conventionally, in outer wall cleaning, detergent has been applied from top to bottom, and then water is sprayed from top to bottom to remove dirt. However, the dripping of already applied detergent overlaps with newly applied detergent. When the outer wall is smooth or has high hydrophilicity, an excessive amount of detergent accumulates, flows down the outer wall, and sometimes cannot sufficiently loosen dirt on the outer wall. In addition, when the outer wall is tall, the work of applying detergent from the top to the bottom in one go requires changing the length of the brush handle every time, which is inefficient. Accordingly, there has been a demand for a technique that can prevent detergent from flowing down and effectively loosen dirt on the outer wall regardless of the state of the outer wall.

[0003] Various techniques have been conventionally proposed to address such problems. For example, a method for cleaning building wall surfaces (see Patent Document 1) has been proposed and is a known technique. More specifically, a method for cleaning a building wall surface is disclosed, which is characterized by applying an aqueous temporary protective coating to the building wall surface to be cleaned and removing the coating film to clean the wall surface. According to this method, the problem of detergent flowing down does not occur. However, cleaning by removing the coating film cannot loosen fine dirt, and the above problem has not yet been solved. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Publication No. 9-75877 [Summary of the Invention] [Problems that the invention aims to solve]

[0005] In view of the above problems, the present invention aims to provide a method for cleaning the exterior walls of buildings that can be applied to the exterior walls in a manner that does not cause the detergent to run off, regardless of the condition of the exterior walls, and that can effectively lift dirt from the exterior walls while using the minimum necessary amount of detergent. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a method for cleaning the exterior wall of a building using a brush capable of dispensing detergent and water, comprising a detergent application step of spraying detergent and a rinsing step of washing with water, wherein in the detergent application step, the exterior wall is divided into multiple areas in the vertical direction, and the detergent is applied in order from the lower area to the upper area, and in the rinsing step, water is sprayed from the top to the bottom of the exterior wall to rinse.

[0007] Furthermore, in the detergent application step, the present invention employs a means to repeatedly perform a first application operation, applying the detergent from bottom to top, and a second application operation, applying the detergent from top to bottom, to one of the areas while moving horizontally, and to start the application of the detergent from either the left or right end of the area, for all areas.

[0008] Furthermore, the present invention employs a first coating method in which the coating position at the start of the first coating operation and the end position of the second coating operation following the first coating operation are the same, while the end position of the second coating operation and the start position of the next first coating operation are different.

[0009] Furthermore, the present invention employs a second coating method in which the coating position at the start of the first coating operation and the end position of the second coating operation are different, and the end position of the second coating operation and the start position of the next first coating operation are the same.

[0010] Furthermore, the present invention provides that the brush has a bristle bundle that contacts the outer wall and a plate-shaped bristle portion having a surface to which the bristle bundle is attached, and the application of the detergent is carried out over a length in the longitudinal direction of the bristle portion.

[0011] Furthermore, the present invention employs a method in which the application of the detergent is carried out by the detergent being ejected from the liquid spray holes inside the bundle of bristles, the tips of the bundle of bristles come into contact with the outer wall during application, and the application of the detergent is carried out on the outer wall surrounded by the bundle of bristles.

[0012] Furthermore, in the rinsing step, the present invention employs a method in which the water is sprayed from the liquid spray nozzle used for applying the detergent, the tip of the bristle bundle is in contact with the outer wall during spraying, and the water is sprayed onto the outer wall within the area surrounded by the bristle bundle. [Effects of the Invention]

[0013] According to the exterior wall cleaning method of the present invention, the detergent can be applied to the exterior wall in a manner that prevents it from running off, regardless of the condition of the exterior wall. Therefore, the amount of detergent used can be kept to a minimum, and dirt on the exterior wall can be effectively lifted. [Brief explanation of the drawing]

[0014] [Figure 1] This is an overall perspective view showing an embodiment of the exterior wall cleaning method according to the present invention. [Figure 2] This is a schematic diagram illustrating the procedure for applying detergent and other steps in the exterior wall cleaning method according to the present invention. [Figure 3] This is a schematic diagram illustrating the details of the procedure for applying detergent and other steps in the exterior wall cleaning method according to the present invention. [Figure 4] This is a schematic diagram showing how detergent drips in the exterior wall cleaning method according to the present invention. [Figure 5] This is a schematic cross-sectional view showing the structure of the brush in the exterior wall cleaning method according to the present invention. [Modes for carrying out the invention]

[0015] The outer wall cleaning method according to the present invention is most characterized in that it enables efficient detergent application when cleaning outer walls of buildings. Hereinafter, embodiments of the outer wall cleaning method according to the present invention will be described based on the drawings. It should be noted that the outer wall cleaning method according to the present invention is not limited to the embodiments described below, and can be appropriately modified within the scope of the technical idea of the present invention, that is, within the scope of shapes, dimensions, structures and the like that can exhibit the same functions and effects.

[0016] The present invention will be described with reference to Figs. 1 to 5. Fig. 1 is an overall perspective view showing an embodiment of the outer wall cleaning method according to the present invention. Fig. 2 is a schematic diagram showing procedures such as detergent application in the outer wall cleaning method according to the present invention, wherein (a) shows the procedure of applying detergent, and (b) shows the procedure of rinsing with water. Fig. 3 is a schematic diagram showing details of procedures such as detergent application in the outer wall cleaning method according to the present invention, wherein (a) shows a first detergent application method, and (b) shows a second detergent application method. Fig. 4 is a schematic diagram showing the dripping state of detergent in the outer wall cleaning method according to the present invention, wherein (a) shows the dripping state of detergent when the detergent is applied from top to bottom, and (b) shows the dripping state of detergent when the detergent is applied from bottom to top. Fig. 5 is a schematic cross-sectional view showing the structure of a brush used in the outer wall cleaning method according to the present invention.

[0017] Dirt on the second-floor portion of a house outer wall or high places that are out of reach is often difficult to easily clean even when noticed. As a cleaning method, there is a method of erecting scaffolding for work. However, merely erecting scaffolding incurs a large amount of cost, and work at high places involves danger. As another method, there is a method using a high-pressure cleaner. However, depending on the outer wall, the water flow is too high pressure, which may damage the wall, so this method cannot be easily selected in some cases. Therefore, the present invention enables safe and efficient cleaning of outer walls by using a cleaning device and an appropriate cleaning method.

[0018] Cleaning device 1 is a device for cleaning the exterior wall. The cleaning device 1 includes a brush 10, a liquid supply pipe 40, a water supply unit (not shown), and a cleaning detergent supply unit. Brush 10 is the part that removes dirt from the exterior wall while releasing detergent or other substances onto the wall. The brush 10 consists of a bristle section 11, a bristle bundle 12, an operating rod 30, and a liquid supply pipe 40. The bristle section 11 is located at the tip of the brush 10 and is roughly rectangular in shape. A bundle of bristles 12 is arranged on the edge of one of its faces, and a liquid spray hole 20 is provided therein. The other opposing face is connected to the operating rod 30 or a support extending from the operating rod 30, and one end of the liquid supply pipe 40 is connected to it. Furthermore, the detergent is applied by the detergent 80 released from the liquid spray holes 20 surrounded by the bristle bundles 12. During application, the tips of the bristle bundles 12 are in contact with the exterior wall K, and the detergent is applied to the exterior wall K surrounded by the bristle bundles 12. The other end of the liquid supply pipe 40 is connected to a water supply unit or a cleaning detergent supply unit as appropriate. A liquid injection port 20 is located on the extension of the tip of the liquid supply pipe 40. If a water supply unit is connected to the liquid supply pipe 40, water supplied from the water supply unit is discharged from the liquid injection port 20. If a detergent supply unit is connected to the liquid supply pipe 40, the detergent supplied from the detergent supply unit is discharged from the liquid injection hole 20. The operating rod 30 is the part held by the worker S. The worker S holds the operating rod 30 with both hands and releases water, detergent, etc., with the bristle bundle 12 at the tip of the brush 10 in contact with the exterior wall K. Worker S moves the brush up and down while keeping the bristle bundle 12 in contact with the exterior wall K, so that the water and detergent released from inside the brush 10 are evenly distributed to the wall.

[0019] The bristle implantation section 11 is plate-shaped and has a surface to which the bristle bundles are attached. A liquid spray hole 20 is located near the center of the flocked section 11. As shown in Figure 5, the detergent etc. released from the liquid spray hole 20 is dispersed into the area surrounded by the flocked section 11 and the bristle bundle 12. It can also be said that the application of the detergent 80 is carried out within the length of the flocked section 11 in the longitudinal direction. Therefore, the detergent 80 is evenly applied to the exterior wall K covered with the bristle bundles 12. By making the bristle bundles 12 at the edge denser, the amount of detergent that leaks through the bristle bundles 12 can be reduced.

[0020] The bristle bundle 12 is the part of the brush 10 that comes into contact with the outer wall K, and consists of a bundle of many bristles. The bristle bundle 12 is arranged on one surface of the bristle-planted section 11. The central part is coarse, while the edges are dense. By making the edges denser, the amount of detergent leaking unnecessarily from the liquid spray holes 20 outside the area of ​​the hair bundles 12 can be reduced.

[0021] The liquid supply pipe 40 is the part that delivers the liquid supplied from the water supply unit or the cleaning detergent supply unit to the brush 10. Since the brush 10 moves to high places, it is preferable that the liquid supply pipe 40 be thin and lightweight. The liquid supply pipe 40 carries liquid from a water supply unit or cleaning detergent supply unit placed on the ground near the outer wall K, along the side of the operating rod 30, and connects to the bristle portion 11, which is the tip of the brush 10.

[0022] The operating rod 30 is the part held by the worker S to hold the bristle portion 11 at the tip of the brush 10 in a fixed position. It is longer than the handle of a typical brush 10 because it is used for cleaning at high places. Furthermore, by connecting extension poles, it becomes possible to reach higher places such as the second floor.

[0023] The water supply unit supplies water to the brush 10 via the liquid supply pipe 40 as needed for rinsing, etc. The water supply unit may be directly connected to a water supply, or a hose from the water supply may be connected to the thinner liquid supply pipe 40 at an intermediate point. Alternatively, the water supply unit may have a storage section inside, and the stored water may be flowed into the liquid supply pipe 40. The cleaning detergent supply unit supplies detergent to be applied to the exterior wall to the brush 10 via the liquid supply pipe 40. It basically has a storage unit to store the detergent and supplies the detergent to the brush 10 via the liquid supply pipe 40 as needed. The connection and disconnection of the water supply unit and the cleaning detergent supply unit with the liquid supply pipe 40 are performed manually by worker S in accordance with the workflow.

[0024] This document describes the procedure for cleaning the exterior walls of a building using a brush capable of dispensing detergent and water. This includes a detergent application step of spraying detergent and a rinsing step of washing it off with water. In the detergent application process, the exterior wall is divided into multiple sections vertically, and the detergent is applied to the sections from the bottom to the top to loosen the dirt. In the rinsing process, water is sprayed from the top to the bottom of the exterior wall to rinse and thoroughly wash away dirt. In the rinsing process, water is sprayed through the liquid spray nozzles used for detergent application, the tips of the bristles are in contact with the exterior wall, and the water is applied to the exterior wall within the area enclosed by the bristles. In both processes, a brush 10 is used, and detergent or water is discharged from the liquid spray hole 20 at the tip of the brush 10. Furthermore, if there is a lot of dust on the surface, a water rinsing step may be added before the detergent application step. The water rinsing step involves pouring water from top to bottom to remove dust and light dirt from the surface. Adding a water rinsing step also allows the liquid to adhere to the exterior wall, preventing the detergent from being repelled and allowing it to be applied to the wall. Additionally, a brushing step may be included between the detergent application step and the rinsing step. The brushing step involves scrubbing the exterior wall with moderate force to remove dirt. Depending on the material of the exterior wall, this may cause damage, so the amount of force used should be adjusted according to the material. The brushing step can also loosen fine dirt from the exterior wall. Additionally, a finishing process may be performed after the rinsing process. The finishing process involves re-cleaning or repairing the surface as needed after drying. Checking the surface after drying clarifies areas that require re-cleaning or repair, thereby improving the quality of the cleaning.

[0025] This section explains the optimal cleaning method for different types of exterior wall materials. If the material is siding, use a neutral detergent and gently clean with a soft brush. Avoid high-pressure washing, and use a specialized cleaning agent if necessary. If the material is mortar, use an alkaline detergent and a stiff brush to clean it. If the material is tile, use a neutral detergent and a soft brush to clean it. Pay particular attention to cleaning the grout lines. If the material is ALC (autoclaved lightweight concrete), it has high water absorption, so use detergents sparingly and clean gently with a soft brush.

[0026] The method for applying detergents, etc., will be explained in accordance with Figures 1 and 2. In this embodiment, the exterior wall K is divided into three regions, designated from bottom to top as the first region A1, the second region A2, and the third region A3 (Figures 1 and 2). Worker S applies detergent 80 to the first area A1 of the exterior wall K. Worker S holds the operating rod 30 of the brush 10 and applies the detergent 80 sequentially, starting from the first area A1. When applying, worker S moves the brush 10 so that the entire bundle of bristles 12 of the brush 10 is in contact with the exterior wall K, and so that the detergent 80 is evenly applied to the area of ​​the exterior wall K enclosed by the bundle of bristles 12. The way the brush 10 moves within each area is, for example, as shown in Figure 2(a), by repeatedly applying paint from the edge upwards and downwards within each area. After the coating of the first region A1 is completed, the coating of the second region A2 is performed. The starting position for coating is the same end side as the starting position for coating in the first region A1. After the coating of the second area A2 is completed, the coating of the third area A3 is performed in the same manner. Figure 1 shows the process of coating the second region A2. Figure 2(b) shows the rinsing procedure. Rinsing is performed in the order of the upper areas to the lower areas. Therefore, the third area A3 is rinsed first, then the second area A2 is rinsed, and finally the first area A1 is rinsed. By performing the rinsing in order from the upper areas, the work can be carried out without any areas being missed. The rinsing action 70 for each area always involves moving the brush 10 from top to bottom. This is because moving it from bottom to top would push the dirt back up.

[0027] The method of moving the brush in each area will be explained using Figure 3 as a guide. The coating operation consists of a first coating operation 50 that coats from bottom to top within the area, and a second coating operation 60 that coats from top to bottom. Figure 3(a) shows an example of movement in the vertical direction. In the first coating operation 50, the starting position 51 of the first coating operation is the lower end of the area, as shown in Figure 3(a). The brush 10 is moved to the lower end position, and the bristle bundle 12 is the starting position 51 of the first coating operation. The worker S moves the tuft of hair 12 vertically while keeping it in contact with the outer wall K, and stops at the first coating operation completion position 52, which is the upper end of the area. This action ensures that the detergent 80 is applied to the bristle portion 11 and the width portion of the bristle bundle 12 of the brush 10. Next, the second coating operation 60 is performed. The starting position 61 of the second coating operation is the same as the ending position 52 of the first coating operation. The tuft of hair 12 is moved vertically downward to the lower end while remaining in contact with the outer wall K. The ending position 62 of the second coating operation is the same as the starting position 51 of the first coating operation. After the completion of the first application operation 50 and the second application operation 60, the brush 10 is moved laterally by the width of the bristle section 11, and the first application operation 50 and the second application operation 60 are performed again. The same process is repeated to apply the detergent 80 to the area. In other words, for a single area, a first application operation, where the detergent is applied from bottom to top, and a second application operation, where the detergent is applied from top to bottom, are repeatedly performed while moving horizontally. This action allows you to apply detergent 80 twice to the same spot, resulting in a more concentrated application of detergent 80. Furthermore, one of the left or right edges of a region is designated as the application start point, and the application of detergent is started from this starting point for all regions. By making the application start point the same for each region, the state of detergent application can be made the same across all regions.

[0028] Figure 3(b) shows an example of diagonal movement and application. In the first application operation 50, the starting position 51 of the first application operation is the lower end of the area, as shown in Figure 3(a). The brush 10 is moved to the lower end position, and the bristle bundle 12 is the starting position 51 of the first application operation. The worker S moves the tuft of hair 12 diagonally while keeping it in contact with the outer wall K, and stops at the first coating operation completion position 52, which is the upper end of the area. The first application operation end position 52 is a position that has moved horizontally from the first application operation start position 51 by approximately half the width of the bristle portion 11 and bristle bundle 12 of the brush 10. This action results in the detergent 80 being applied diagonally to the width of the bristle portion 11 and the bristle bundle 12 of the brush 10. Next, the second coating operation 60 is performed. The starting position 61 of the second coating operation is the same as the ending position 52 of the first coating operation. The bristle bundle 12 is moved diagonally downward to the lower end while remaining in contact with the outer wall K. The ending position 62 of the second coating operation is a position moved from the starting position 51 of the first coating operation by the width of the bristle portion 11 of the brush 10 and the bristle bundle 12. The first application operation 50 and the second application operation 60 are performed again. The same process is repeated to apply the detergent 80 within the area. In other words, in the second coating method, the starting position of the first coating operation and the ending position of the second coating operation are different, while the ending position of the second coating operation and the starting position of the next first coating operation are the same. This action results in a thinner coating thickness than when applied vertically, but allows for efficient application of detergent 80.

[0029] Thus, since the first and second application methods have different characteristics, the two application methods may be used appropriately depending on the condition of the exterior wall. For example, if the soiling is severe, the first application method can be used, while if the soiling is light, the second application method can be used. For a single exterior wall, it is conceivable to switch between the first and second application methods depending on the location on the wall.

[0030] The effect of applying detergent from bottom to top will be explained in accordance with Figure 4. Figure 4 shows a case where the exterior wall area consists of two regions, the first region A1 and the second region A2, with the exterior wall as a cross-section and the detergent schematically represented. Figure 4(a) shows the case where the detergent is applied from top to bottom, and Figure 4(b) shows the case where the detergent is applied from bottom to top. The left side of the diagram shows the state after applying detergent to the first area, and the right side shows the state after applying detergent to the second area.

[0031] 1. It can prevent stains caused by detergent drips. If you apply detergent from top to bottom, any spilled detergent will get on the untreated lower surface (area A). This means that the detergent will take effect earlier in that area, potentially resulting in a visible stain. In contrast, when applying detergent from bottom to top, any drips will only go to areas where the detergent has already been applied, meaning the detergent's effect has already begun, and the impact of leakage is minimal. 2. It can reduce drying of the upper part. When applying detergent from top to bottom, some of the detergent applied to the top may drip down as you apply it. This could reduce the amount of detergent on the upper wall, potentially weakening its effectiveness or causing it to dry out (part B). In contrast, by applying the detergent from bottom to top, the amount of detergent movement in the overlapping areas is reduced, and the amount of detergent in the upper part does not decrease (part C). Furthermore, when applying detergent from bottom to top, the lower surface is replenished with detergent by the small amount of detergent dripping from the top (part D), allowing for a uniform application of detergent overall and resulting in a stable cleaning effect. 3. The lower part of the exterior wall is closer to the worker, making it easier to check the cleaning effect. Applying detergent from top to bottom means starting with the upper walls, which are difficult to see. In this case, it may be difficult to adequately check whether there is enough detergent or whether the cleaning effect is being fully realized. In that case, even if the amount of detergent is insufficient, the confirmation of its effectiveness may be delayed, potentially requiring the work to be redone. In contrast, when applying detergent from bottom to top, the lower part of the exterior wall, which is the first area to be treated, is directly in front of the worker, making it easy to check the effectiveness of the application. Therefore, the application method can be changed depending on the effectiveness, allowing for optimization of the cleaning process. Also, generally speaking, the lower part of the exterior wall is often dirtier. Applying the detergent from bottom to top allows for a longer reaction time for the detergent in the lower areas.

[0032] As mentioned above, one of the advantages of this embodiment is that the effect can be confirmed at the start of detergent application. Therefore, it is conceivable to change the type of detergent, the amount applied, or the application method depending on the condition of the detergent application in the lowest section of the exterior wall. For example, if the detergent is not effective, one might consider changing the type of detergent from a neutral detergent to an alkaline detergent, increasing the amount applied, or changing the application method from the second application method to the first application method. By applying the detergent from the bottom up, it is possible to check the details of the detergent application's effect and optimize the application method.

[0033] Thus, according to the exterior wall cleaning method of the present invention, the detergent can be applied to the exterior wall in a manner that prevents it from running off, regardless of the condition of the building's exterior wall. Therefore, the amount of detergent used can be kept to a minimum while effectively lifting dirt from the exterior wall.

[0034] Furthermore, according to the present invention, by applying the coating in the vertical direction for each region, the coating area can be applied uniformly and efficiently.

[0035] Furthermore, according to the present invention, depending on the condition of the exterior wall, it is possible to select either a vertical or diagonal direction for coating each area, thereby enabling more efficient coating.

[0036] Furthermore, according to the present invention, the degree of cleaning effect of the detergent at the start of application can be checked in detail at eye level, so the type of detergent, the amount applied, and the application method can be changed immediately, and cleaning can be performed efficiently.

[0037] Furthermore, according to the present invention, since the bristle bundles are in contact with the outer wall and the detergent is applied from the liquid spray holes inside the bristle bundles, there is no unnecessary diffusion of the detergent, and it can be applied uniformly and efficiently to the outer wall.

[0038] Furthermore, according to the present invention, the rinsing water is ejected from the internal liquid injection holes surrounded by a bundle, just like the detergent, so there is no unnecessary diffusion of water, and it can be sprayed uniformly and efficiently onto the exterior wall. [Industrial applicability]

[0039] The exterior wall cleaning method according to the present invention allows for appropriate application of the detergent to the extent that it does not run off, regardless of the condition of the building's exterior wall. Furthermore, it effectively lifts dirt from the exterior wall while using the minimum necessary amount of detergent. Therefore, it is understood that this method has great industrial potential as an efficient way to clean exterior walls. [Explanation of symbols]

[0040] 1. Washing device 10 brushes 11 Hair transplant area 12 strands of hair 20 Liquid injection hole 30 Operation rod 40 Liquid supply pipe 50 First coating operation 51 First application operation start position 52 First coating operation end position 60 Second coating operation 61 Second application operation start position 62 Second coating operation end position 70 Rinse operation 80 detergents S Worker K Exterior wall A1 First area A2 Second area A3 Third area

Claims

1. A method for cleaning the exterior walls of a building using a brush capable of dispensing detergent and water, This process includes a detergent application step of spraying detergent and a rinsing step of washing it off with water. In the detergent application process, the outer wall is divided into multiple regions in the vertical direction, and the detergent is applied in order from the lower region to the upper region. For each region, a first application operation of applying the detergent from bottom to top and a second application operation of applying the detergent from top to bottom are repeated while moving horizontally, and the application of the detergent is started from either the left or right end of the region, for all regions. The method for cleaning exterior walls is characterized in that, in the rinsing step, water is sprayed from the top to the bottom of the exterior wall to perform rinsing.

2. The coating position at the start of the first coating operation and the end position of the second coating operation following the first coating operation are the same. The exterior wall cleaning method according to claim 1, characterized in that the end position of the second coating operation and the start position of the subsequent first coating operation are different, using a first coating method.

3. The coating position at the start of the first coating operation and the coating position at the end of the second coating operation are different. The exterior wall cleaning method according to claim 1, characterized in that a second coating method is used in which the end position of the second coating operation and the start position of the subsequent first coating operation are the same.

4. The brush has a bristle bundle that contacts the outer wall and a plate-shaped bristle portion having a surface to which the bristle bundle is attached. The exterior wall cleaning method according to claim 1, characterized in that the application of the detergent is performed within the longitudinal length of the flocked portion.

5. The application of the detergent is carried out by the detergent coming out of the liquid spray holes inside the bundle of bristles, and during application, the tips of the bundle of bristles come into contact with the outer wall. The method for cleaning an exterior wall according to claim 4, characterized in that the application of the detergent is performed on the exterior wall surrounded by the bundle of hair.

6. In the rinsing step, the water is sprayed from the liquid spray nozzle used for applying the detergent. The exterior wall cleaning method according to claim 5, characterized in that the tip of the bristle bundle is in contact with the exterior wall during spraying, and the spraying of water is performed on the exterior wall within the area enclosed by the bristle bundle.

Images