You should never put Dawn dish soap into a pressure washer or use it as a primary cleaning solution. The high-pressure pump injection system can become clogged or damaged by improper soap viscosities, and Dawn produces uncontrollable suds that overwhelm the machine. Moreover, dish soap leaves a sticky chemical residue on siding that attracts airborne dirt and pollutant grime faster, and it can strip away protective exterior sealants and damage delicate garden plants.
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