You should never put Dawn dish detergent or standard household dish soaps into a pressure washer. Household dish soaps produce excessive, thick suds that can clog or permanently damage the internal seals, valves, and pumps of your pressure washer equipment. Furthermore, dish soaps strip protective waxes off vehicles and outdoor surfaces, leave a sticky residue that attracts dirt rapidly, and can harm surrounding plants and landscaping when rinsed off.
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