I use Mark's quite frequently and usually in the very early morning (12 - 3am). It's not usually dirty other than dryer sheets on floor and the machines are well maintained. I will say that I wouldn't leave your clothes untended for very long as there have been a few problems but these machines are fast. The convience store next door is also 24/7 and has an ATM.
Its not terribly dirty, but could be cleaner. The dryers dry fast. Everything was replaced after the hurricane. No ATM that I can remember but it is right next to a convenience store and they have an ATM.
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