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I use reverse osmosis, filtered and deionized water at 0ppm for washing my cars. 0 spots and no towel drying. Much faster and no risk of towel scratches. Just need a 35 gal Tuffy trash can, filtration from salt water fish store. I use a Ryobi stick pump with a garden hose and it can wash 3 cars per trash can of water. Been using the filters and DI granulars for years with still perfect results.
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