The best detergent depends entirely on the specific surface you are cleaning. For house siding and vinyl exteriors, biodegradable house-washing soaps containing surfactants and mildewcides (such as Simple Green or Zep) are ideal. For concrete driveways and greasy garage floors, heavy-duty alkaline degreasers work best, while specialized oxygen bleach cleaners are recommended for weathered wooden decks. Always verify that the soap is labeled safe for pressure washer injection.
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