We've been on the road this weekend as we look for houses as we're a bit "homeless" at the moment. Since you never know what's around the corner (quilt shop, great sign, two headed cow, who knows), I strongly believe you need to have your camera with you at all times. So glad I did as we stopped for gas and a snack. Had never seen this before and I appreciate the ingenuity. Was hard to tell the price but I think it's $1/wash. There are "small dog" and "big dog" booths? Love them!