I came here once when I was having my car moved out to Texas.  Needless to say, my car was ridiculously covered with dirt and grime that hadn't been washed for about a year.  And hey, don't judge, I barely drove the thing and I really wasn't visibly obviously dirty.  Anyways, I was pleasantly surprised with what 5 bucks got you.  Sure, there were still a few spots here and there and the drying isn't phenomenal, but you can't beat the job it does in about 5 minutes.  Plus free vacuum?  I'd definitely come back and even sign up for the unlimited month if I was still in town!