Not Ranked
I worked in the chemical business for many years, especially with detergents, sanitizing, and rinsing agents, and I never saw any kind of filter that would remove hardness, or the things that would cause spots after drying. There are chemicals that can be added to detergents, or preferably rinse water, to eliminate most spotting. Therefore, I believe that their claim that the filter eliminates spots is bogus. There are other car wash compounds that dry mostly spot free without the "kit" that Mr. Clean wants to sell you. Why not just try their detergent in a bucket and see if it dries spot free by itself? I'll bet it does.
Bumpster
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