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How to Remove Moss, Mold and Mildew From Patios and Outdoor Surfaces


sponge in soapy water and bucket John Slater/Photodisc/Getty Images
Oh, yuck. What's that gross-looking green stuff on your concrete patio? Probably mold, mildew or moss -- the dreaded three M's. Whatever it is, you need a sure way to remove it that won't destroy nearby landscaping and harm the environment with a blast of harsh chemicals.

Mildew Remover

  • Dissolve together: ½ c, vinegar
  • ½ c. borax in warm water
  • Apply with sponge or spray bottle
Difficulty: Easy
Time Required: One-half to one hour

Here's How:

  1. Hose-down area with strong spray from power nozzle.
  2. Mix ingredients in bucket.
  3. Apply solution with sponge. Do one area at a time.
  4. Allow cleaning ingredients to permeate surface for a few minutes. Go to the loo, get a cup of coffee or whatever, and return.
  5. Don your waterproof rubber gloves, get down on your hands and knees (here's where knee pads might come in handy), grab the hard-bristle brush and start scrubbing. Scrub in circular, clockwise or counterclockwise motions, tackling about a 3'x 3' area at a time.

    Dip the brush into the solution if you start to run out.

  6. Having some big fun now? Keep going, one 3'x 3' area at a time, until you see some progress. Make sure you get the entire green-infested patio, walkway or surface. Just think how strong your scrubbing arm will be. Switch arms for an evenly toned workout.
  7. Using a strong spray, again hose-down the patio or surface you just scrubbed. If you followed directions, used the right amount of pressure while scrubbing, and didn't slack off, the green patio should start to look concrete-colored again. Or, at least less green.

    While drying, try to provide as much sunlight to the once-green patio as possible. If the area is in shade, you might want to trim trees or hedges that are creating the shade -- moss and mildew love dampness and shade.

    If you don'ttrim those branches, hedges and vines that are blocking out the sunlight, you'll find yourself having to do this chore yet again -- very soon -- on a day when you could be relaxing or at least doing some other kind of DIY project.

What You Need

  • Bucket
  • A large bottle of white vinegar
  • Water
  • Hard-bristle scrub brush
  • Knee pads
  • Hose with power nozzle or a power washer
  • A strong arm (or two)
  • Perseverence

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