I spray my van with a hose at the condo that I live and wipe it down with a beach towel. No soap as it does not scratch. Takes 5 minutes and is free.
You can also buy a man made chamois (Advanced Auto) that works better than a towel. Make sure you fold it and put back in container wet. They are designed to never get dry. You can wash it when it gets dirty which I have not done yet even though mine is dirty. I use it for my black car and do not use soap either. FREE WASH!!! : ) Right in line for our budget!!
If the damage was their fault why wouldn't they pay you? Did you threaten to sue? I would have went to see an attorney. Anyway I think I've seen the owner. Is she that hideous overweight white lady that looks like she used to be a heavy drinker / smoker / meth head? I feel sorry for you if you had to deal with her. I saw her screaming at one of her employees one day. *shudder*
her name is Kathy and she is one of the managers, redneckish looking lady but nice believe it or not. Getting an attorney is easier said than done if the damage is 4k and you spend half in an attorney you realize ir makes no sense. They eventually paid for the damage after 3 months and 3 estimates and countless hours of threats legal and otherwise but i was forced to take the car to a place other than my choice but the owner is a *ick head. I also had my "membership" with them for a long time and ppl are generally nice, i just hope you wont have to meet the owner