- 1). Put on an N95 dust mask/respirator (available at most hardware stores) to avoid breathing in mold spores as you clean the driveway. You should also wear rubber gloves, in case your hands come into contact with the mold or with the cleaning products.
- 2). Remove yard debris, if applicable, from the drive using a push broom. Dispose of all potentially contaminated debris in a plastic bag, because fungus spores can travel. Sealing and disposing of potentially contaminated debris on your driveway helps prevent cross contamination.
- 3). Fill a bucket with water from your garden hose. Mix in a biodegradable mold and mildew cleaner with the water, unless the label states you should apply it undiluted. Bleach kills fungus, but overspray or runoff is tough on grass and other plants in your yard. You should easily find outdoor biodegradable mold and mildew killers at larger home improvement stores.
- 4). Mop the solution over your entire driveway. Even areas of concrete that do not show obvious signs of fungus may contain spores.
- 5). Scrub fungus-stained areas of the concrete with your push broom (or use a hand-held, nylon-bristled scrub brush, if that is easier for you). Allow the fungicide to remain on the driveway for as long as the label indicates. You may not need to rinse it off--it depends on which brand you use. If you must rinse it off, just use your garden hose. If you are tempted to use a pressure washer, you may wish to reconsider. The Ask the Builder website warns that these can erode concrete surfaces over time.
- 6). Use the mold and mildew killer to disinfect any cleaning tools you used on your driveway. Live spores may still be present on the broom or mop, for example. You do not want to spread the fungus to other areas. For this reason, it is also a good idea to spray some fungicide on your shoe soles before entering your home.
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