I am adding this sugguestion on behalf of my autisic step son we have brought him a Hot Wheels car wash and he has 2 of them and the biggest problem is it keeps burning out its electric motors and we need a mod that can over come this problem. I have tried rebuilding the unit useing the first for spare parts but also failed and he misses it a lot. The motor drives a fan that produces bubbles and it is geared to drive a bubble maker all off the same motor. If required I will send photos of the present set up. the possible problem is that I live in new zealand.
Many Thanks,
David Grey