Recently discovered a self serve car wash that has an interior shampoo tool. Concerned about the cleanliness of the water it uses. My understanding is that self serve car washes recycle all their water, and I’d assume the water for these shampoo tools is also filtered/recycled, but the key question is - even though it runs clear, how clean really is that water? Not keen on covering all my seats with semi-dirty or even contaminated water.