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I find rinse only method to still leave spots later. I'm starting to move to spotless for more than just final rinse. I'll do most of the wash without it, but I'll incorporate it earlier, like when I wash off soap for the last time, apply a touchless sealant, for example, then a final rinse.
And I don't have bad water at all, TDS of 210 from the source here.
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/// 2004 Silvergrey M3 · Coupe · 6MT · Slicktop · zero options
/// 2011 Jerez/Bamboo E90 M3 · DCT · Slicktop · IG: @na.s54
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