The wash we used in Boulder CO was $5/3:30! The place was a dump but in a convenient location.
Soap and pressure was poor. Place looked like it should be torn down so some places in CO are charging more than on the coasts.
I know of an owner who (in MD) starts at $1, dispenses $1
tokens, and accepts quarters if they walk on the site. His rate is $1/min. The place is located in the right demographics for self washing and the owner keeps up the place and equipment. He has a site manager there most of the time during the daytime hours. Making bank so the low start price is not a negative. That said having a site manager helps keep people from using a bucket to wash their vehicle.
I would move to dollar
coins for the
changer, and $1/start then set the time per 25cents to a rate you are comfortable with. If you are clearly keeping up the place and providing good amount of
soap and pressure customers will continue to use your place. If someone leaves over spending an extra dollar at your place then you probably do not want them as customers.