The invention discloses a flexible
printed circuit board washing agent, a flexible
printed circuit board washing method, a flexible
printed circuit board, and
electronic equipment, and belongs to thetechnical field of circuit board washing. The flexible printed circuit board washing agent comprises, by
mass, 30 to 45% of N-methyl pyrrolidone, 20 to 35% of butyrolactone, 1.5 to 3% of a carboxylicacid complexing agent, 0.5 to 2% of a penetrating agent, and the
balance water. According to the flexible printed circuit board washing method, the flexible printed circuit board washing agent is usedfor washing the flexible printed circuit board. The flexible printed circuit board washing method is capable of solving problems in the prior art that complete removing of residual
rosin is impossible to realize using conventional flexible printed circuit board washing agent,
white spots are left on the flexible printed circuit board after washing, the conventional flexible printed circuit boardwashing agent is not safe, and is not friendly to the environment, and
water washing is inconvenient to realize after applications of the conventional flexible printed circuit board washing agent. Theflexible printed circuit board washing agent is capable of removing
rosin matters left on the flexible printed circuit board, and removing
metal oxides and
grease on the flexible printed circuit board, is excellent in
stain removing effect,
corrosion of flexible printed circuit board is not caused, after washing, the surface of the flexible printed circuit board is clean and bright, and no whitespot is generated.