Horrendous experience.
My SO and I had a groupon for 3 "Works" car washes. So one day after work we decided to meet there and get our cars cleaned up. He got there 10 minutes before I did and told them I was on my way. They washed his car but when I showed up they told me they had closed. It was 5pm and their website says they are open til 6pm. After I demanded to speak to the manager they said they would wash the outside of the car but not the inside. He said they closed early for weather (it was cloudy with no chance of meatballs) and it was "upper management's call". I then explained that I was in a bind because I planned to refund my groupon (why would I want to support this business, much less go there again if they close on a whim?) but they had already washed my husband's car. He said that's "your problem". Never apologized.
So, if after reading this you still choose to go, call first to see if they plan on staying open for the whole day. And don't go if it is cloudy.