What kind of experience has anyone had with Spotless Water systems (De-Ionization). I have hard water and it makes white spots on everything.We had white cars & trucks in the past and it wasn't as much of an issue, but now we havea black truck and a dark green mustang and I wash them a lot more often because of the gravel driveway. I am trying to decide if it is worth the $420 initial investment or if I would have decent results with using softened water...cost to put in a hose bib from my softener is negligible, I probably already have the parts.