Any sort of proof on this vs a bath using regular house water from the tap outside?
Yes. I don’t have any water spots. Regular water is very hard. Lots of minerals and chlorine. I strip all that out from the city supply. With the system I am using it’s about like washing my truck with bottled water. I know the water is nice and pure because we don’t have spotting in the showers or sinks which uses the same water. I have on occasion let my truck drip dry in the garage overnight and then come out the next morning and run a detail spray over it. No spots anywhere. I sometimes wash it mid day with full sun.
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