Hard Water ?

[ts27330]

The post above was done when I was typing my response. That filter won't remove hardness. Hardness is calcium and magnesium. Only way to remove it is with chemicals to remove hardness or other treatments such as reverse osmosis. The easiest way would be to use a leaf blower to get most the water off the truck before it dries. If it doesn't dry on the vehicle it won't leave the hard water spots

I second the leaf blower. I also make sure that my truck has a good coat of wax/polish. That way the water runs off easily and the leaf blower finishes the job. I take a clean towel and go over the truck and the finish is like new (2014 Laramie). I do keep my truck garaged at home and that helps between washes.

 

[JS4024]

MOVE.... or put in a water softener at your home......