I have well water and when I wash the cars, if I don't dry them immediately, they spot like a MO FO. If the sun is out (just a little), they seem to spot before I even get a chance to dry them. What I am looking for is either an attachment I can put on the end of the hose for a final rinse or a filter system on the spigot from the well. Oh yea, did I mention I prefer to TRY and keep the cost down. I remember seeing a few out there awhile back, but I forgot the names of the products. Any suggestions will be appreciated.