Haha! I think you can do it! And if the old guy with the Santa Claus beard yells at you, just give him that look like you had no idea you can't handwash in there. And yea summer time with a line behind each bay I wouldn't do a handwash in there. Well, in summer I just wash my car in the driveway but if I did go there I would follow the rules with cars waiting behind me.