Never again at this location. I pull up, and was totally harassed. "Ahh - a Groupon deal! Did you stamp this wash card yourself? Looks forged! Print it out at home? Color it in? Know what you need - a new windshield!"
Management, I bought a Groupon to try your business out - to see if I wanted to switch car washes, not to be teased because of form of payment.
The worst part was that I couldn't even address the behavior with someone - the manager was one of the guys harassing outside! They didn't have a person at the desk for five minutes so I could present my wash card. Even then, zero pleasantries, zero respect. The only saving grace was a decent car wash.