At my place we run off of a well. The water is very bad and you have to dry the car right away or else it will leave spots. I was wondering if their was some sort of filter that you can purchase to put on the hose?

 

yeah, they sell in-line filters for your garden hose that will filter out the deposits. Or you can get the Mr. Clean Auto Dry kit.

info about that garden hose filter:
http://www.pwgazette.com/gardenhosefilters.htm