around a week or two ago i was at my local waterworks self serve carwash, when i was through washing my car i pressed the stop button and it kept going. this wwent on for 5 more minutes when it finally stopped at $17.00 ! while this kepts going I was starting to panic somewhat because what if it kept going forever charging me much more money! I was NOT one of those who forgot to press stop . I kept hitting stop and it kept going until it finally maxed out. Im using the cash feature from now on there.