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Could the wrong cleaner do more harm than the stain? Black spots, green growth, and pale chalky marks can all make Cambridge Pavingstones look neglected, but they may have different causes and need different approaches. …

What if the pressure washer isn’t the problem, but the kind of stain left behind? You’ve blasted away loose dirt and surface grime, yet those dark patio spots are still staring back. The answer to “Why pressure washing w…