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The CR Spotless DIC-20 works for me. I only use for the final rinse and that final rinse should be a long one. So long I usually go around the car 3-4 times to make sure I've replaced the hard water with the DI water. It's expensive but with my hard water, it's the only thing I've found that works.
The problem is drying. I use the electric blower to know off the majority of water and then with VERY lightly dry with a towel. I've been using Beadmaker to spritz the towel and surface as well.
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