Professional auto salons and detailing garages pay close attention to water quality for a reason. Consistently using or exposing any vehicle to hard water leads to harmful water spots that are challenging to remove. Hard water has increased traces of magnesium, calcium, and iron that are harmful to clear-coat paint and could prove detrimental to car wash equipment. When hard water dries over paint, it creates unsightly water spots, which are practically traces of the hard minerals left behind
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