One of the best bus washes we ever got done was at a walmart, yep, their not just for camping anymore lol, a group of church kids were holding a car wash and they had a sign up for 5 bucks a wash, you should have seen the looks on their faces when I pulled into line with the bus lol. I gave them 40 bucks and they had a ball and really did a great job, even had a water fight lol.