Things You Will Need
How to Clean Algae From Porch Railings
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Fill the bucket with water and biodegradable cleaner as indicated on the manufacturer's label—generally a 1-to-1 ratio.
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Dip the brush into the cleaning solution.
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Scrub the areas of the porch railing covered in algae. A circular motion works well to loosen up the dirt, algae, mildew and grime on the porch.
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Spray the railing with the power washer. This will remove all the dirt, grime, cleanser and unsightly algae. Start on one end and work your way across at a slow, consistent pace. Wash the railings from the top down, making sure to get into any groove that may contain algae to prevent its premature return.