The last business my Dad was in for 20+ years was supplying equipment to self service car washes. The two pumps he liked best were CAT and Giant pumps. His criteria was service and maintainability. Here are a couple of links. The first is a chart at CAT showing item to clean and recommended pressure. The is to Giant car wash pumps.

http://www.catpumps.com/pdfs/appsheets/PSIChart.pdf

http://www.giantpumps.com/carwashpump.htm

Larry


I don't own a vehicle that isn't old enough to drink.