Mold, Mildew

Published on March 26th, 2014 | by Henri


Mildew on synthetic-wood deck

Q.    I have a mildew problem on my deck along the outside back edge where the sun doesn’t hit. The deck is made of synthetic boards (I don’t remember the trade name; they are light gray.) What percentage Clorox bleach to water? Should the solution be left on or scrubbed with a brush?

A.    Your deck boards are probably Trex, a synthetic mix of supermarket plastic bags and wood waste products. — and a very good use of recyclable materials.

The solution I recommend for cleaning mildew from surfaces is one part Clorox bleach to three parts water. It is also a good idea to mix a cup of TSP-PF per gallon as a detergent to remove other pollutants (TSP-PF stands for trisodium phosphate phosphate-free). You can spray the solution or pour it on the deck boards and follow that with a good scrubbing with a stiff long-handled bristle brush.

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