There is a punch card system. Use a 3, 5, or 7 load washer and get a 'punch'. Also get one for checking in on Yelp, and for a review on Google or Yelp. I could fill up a card in one visit!
The man and woman (I'm assuming owners) are courteous and helpful. They have a pop machine, but sadly, no Diet Coke...
CORRECTION she does have Diet Coke in the back, just ask for it!
VERY clean machines and facilities. They also sell some candies and snacks, and ice cream products. You may only eat foods sold here while on the premises. No big deal - there's a bench in the shade outside and a BK next door. A great find overall!