Ken,

Purchase a gallon of TAN Power.

http://www.pressure-washers.com/chemicals.htm

Only fill your foamer bottle about a quarter with tan then top off with water. I used about an 1/2 foamer bottle for the whole bus. It was 60 down here in MB, so don't know about the heat evaporation rate yet.

I also purchase a gallon for RED Power which is the wax. MORE is NOT better. Only fill foamer bottle about 1/8th, then top w/ water.

VERY IMP: Clean foamer bottle with fresh water and using the pump when finished to prevent chemical build up in dispenser head.

Your buddy,

M