Soap drying on black paint issue!

Salt that is left over from the softener? My brother would leave a glass with a slight amount of water in it and after it evaporated, it left behind a film...his installer indicated that there's a slight amount of salt that makes it into the water and that's what he was seeing....the water would evaporate leaving the salt behind. My brother washes his car with softened water and it always leaves a film or residue when he's done washing and drying and has to use a QD to wipe it away.

I'm thinking that's going to be the issue. If I leave it out to dry there will be "salt" spots left over on the paint from what you're explaining. I think my best bet is just to rinse every panel after washing to prevent the residue buildup?
 
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