Quick update: the water softener cartridge wasn’t near enough, I purchased and tried the de-ionizer cartridge and it worked perfect. No spots at all, I left the car wet when I drove around the block and then back in the garage, next day all good. You can get the de-ionizing cartridge from the same company on the first post for about $36, used just for rinsing after washing one section at a time, website said you can get about ~100 gallons, then throw away and order another, no recharging or refilling.
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-Keith
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