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What if those stubborn black dots aren’t ordinary dirt at all? Black marks on a driveway or sidewalk can be algae or fungus, but grime and other stains may look similar. Choosing among Driveway Cleaning Products before i…

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…