I like the idea of supporting the kids, but I need to emphasize the point made above about the gritty rags. If you have a vehicle with a decent paint job, it is CRUCIAL to not let gritty rags be used for the main wash. Remember that grit can be near invisible. Rags pick up heavy grit when the previous car is washed on its lower potions and the wheels. That makes the rags like (stealth) sandpaper for the next vehicle. Imagine the horror of pulling into a carwash where they use obvious sandpaper to do the washes. If you use the charity wash with kids, just toss them several new or clean rags of your own (an additional donation), and ask that they clean starting at the top and ending at the bottom. It took me many years of obliviousness before I realized where all those swirls on my car hoods and trunks were coming from - my own lack of caution and tidiness.