We accept credit cards in all of our ss bays and our display starts at $2 which we set it at and clicks up in .25 cent increments. There is no time involved what so ever. If you think about it people aren't really interested in how much time they spend in the bay but rather how clean their car is and how much money they are spending. With the meter clicking up .25 cent at a time they are not really trying to beat the clock, they are more relaxed in the bay and try more functions. We are averaging 25% cc sales at one site and 18% at the other site so cc sales are pretty strong. We changed the max out from $10 to $15 b/c some customers were still washing as their bill went past $10 and the wash would stop on them and they thought it was broken. We changed it to $15 and have had no issues. Been open at both sites for over a year and have only had 1 call where someone drove off and forgot to turn it to the stop position and it charged $15. Gave her a code for a $10
autowash and she was happy. We also have air dryers in all the bays which help our average time. When wash is over it shows amount spent then if they want a reciept we have 1 central receipt printer next to the
changer and
vending machine that they can swipe at and it communicates with the bay they were in and gives them a printed receipt. This goes over well with with County/work vehicles that hand wash and need a receipt to turn in.