I wish I'd seen the other reviews about the windshield scam before I went...and fell for it...for a nick the size of a pen point. We were told that we'd get an invoice first (before the "repair") but that didn't happen. When we finally got around to the invoice person, we indicated that we didn't want it anymore, but she said "the work was already done," and "we shouldn't have said yes in the first place." (I told the guy no 4 times but he kept badgering me, and I guess I had a moment of weakness).
Luckily, we're bulldogs with customer service, so we made sure we talked with our insurance first and made them guarantee us there would be no rate raise on our insurance and no expense to us at all.
The carwash was fine, but the windshield deal is losing this place customers, including me. Just say no. I'd say a 4 for the wash, a 0 for the scam, so an average of 2. They need to read their yelp reviews and get rid of that "service" that they offer.