My boys have learned to wash and dry the exterior as well as vacuum, wash surfaces, and clean windows inside the car. They like having an opportunity to earn some money; I like having a clean car.
At any rate, they recently asked if they could wash the car. They gathered the supplies and went outside. Later I stepped out to check on them and found this:
Naturally I ran to get my camera, laughing as I went. I thanked God that I have hard-working little boys who know how to enjoy their work.