I've asked this question today, but how to properly do a water break-in on a brushed motor.

I've read about it in a magazine, but it wasn't clear enough. How much of the motor needs to go in the water? How long does it need to dry out (should one use WD-40 to disperse the water)? Where exactly does the oil go after the motor is dry? How much oil? What kind of oil?

Pictures would be very helpful. For someone who doesn't know what names of the parts are, a description of what to do is not always that helpful.