why to avoid water? i remove the engine and the electronics! and when i want a fully clean rebuild i clean with this way: 1.remove engine and electronics and pipe,2. apply cleaner for motocross bikes(for 10 minute) ,3. drop warm water with presure and clean it well,4. i leave it in the sun, 5. unassample all the car and the bearings clean with dw-40 and then i lube them with bearing oil ,6 clean all the car, lube all the moving parts,put grease at diffs,seal some points,polish all the metals,put the electronics,6. maintance the engine and put at the car,7.polish the pipe 8. clean the body! and at some plastix i drop in a towel wd-40 and i clean the plastic parts and is like new!