The best detergent depends entirely on the specific surface material you are cleaning. For house siding, biodegradable mildew-removing cleansers like Simple Green or Zep are ideal. For concrete driveways and oil-stained garage floors, heavy-duty degreasers like Oil Eater or Krud Kutter work best. For wooden decks, specialized oxygen bleach deck cleaners restore weathered wood. Always select detergents explicitly labeled as safe for pressure washer pump injection systems to prevent damage.
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