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If you think a pressure washer is the ultimate weapon against a dirty garden, you might actually be making the problem worse. While high pressure blasts away surface grime, it often leaves the microscopic roots of algae …

Why is it that the harder you blast your stone with a high-pressure hose, the faster those stubborn black stains on your patio seem to return? You aren't alone in your frustration. Many homeowners spend entire weekends s…