Mold, Mildew

Published on July 28th, 2015 | by Henri


Green mildew on vinyl siding

Q.  I have green mildew on my vinyl siding. I used a 2200 PSI power-washer and was not able to remove all of the mildew. Is there a solution I can use to get the rest off without damaging the vinyl siding or do you have any other suggestions?

A.  I assume that you used a weak mixture or didn’t use bleach at all in your power-washer. Power-washing any mildewed surface without a strong bleach solution may remove some surface pollutants but it will not remove the mildew. If the mildew is found on small and easily accessible areas, you will have more success if you do it by hand because it is not easy to have the right concentration of bleach mixed with the water going through a pressure washer.

Wear heavy rubber gloves, mix fresh Clorox bleach and water in equal quantities in a 5-gallon plastic pail, and apply the solution with a soft bristle brush so as not to scratch the siding. If you add a cup of TSP or TSPPF detergent (buy in hardware stores) per gallon of the solution, you will also remove any other stubborn stains that plain water from the pressure washer didn’t get. If you only use a bleach solution, do not rinse it. But if you use detergent, you will need to rinse the treated areas.

Be sure that you cover vegetation with plastic after soaking it before and after the washing.

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