You think using a hair dryer after using something flammable is not fun, my LSMG told me he uses lighter fluid in the motors when they are running sluggish. Says he soaks them (probably the brushes and commutator area although he didn't specify ) then turns the motors on and runs them as the lighter fluid cleans them. I said: "that could make a flash fire couldn't it"? He said, "I've had my eyebrows singed a time or two". Guess what I don't do ......
Joe