cleaning the motor like that works well, if you keep it submerged for more than 10 or 20 seconds though you will damage your brushes, they wear very quickly when wet. really they should be replaced after cleaning underwater. if you cant get your head round electrics and water mixing, consider this, water isnt actually that good a conductor, what it does is greatly reduce the resistance of any surface it is in contact with. i used to use 4.8 volts, spray with motor cleaner, dunk (just clean water) then motor cleaner again and reoil motor
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