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Thank you. Actually, there have been a few times when they just choose to wash it. Maybe it is living down the gravel road that makes them want to.

I am sure it is actually fun playing with water and doing "grown up" stuff at the same time. We are not supposed to wash cars at home. For one, we are in a desert and the water in car wash centers gets recycled. The more important part is that everything drains pretty quickly into the ocean and the oils and such from cars are great polluters.
So, when my truck gets a wash, it's in a car wash place.