Put on a pair of heavy duty rubber gloves because you are about to deal with bleach which can prove highly irritable.
Cleaning cedar siding with bleach.
How to clean cedar siding with bleach 1.
One method used to determine if spots are from these two conditions is to treat them with a solution of bleach 1 part diluted with water 9 parts.
It is non toxic to trees and vegetation and will not remove natural color from the siding.
Both chlorine and oxygen bleach have great anti microbial qualities that allows them to clean and disinfect the surfaces they are applied to.
Spray a generous amount of the bleach mixture onto the siding.
Water any grass.
This is not the case for oxygen bleach.
Unfortunately even in small amounts chlorine bleach eats away at the material it is applied to and in the case of your cedar siding it can weaken your wood s fibers.
Mildew and tannin stains are often the causes of dark spots on cedar shakes.
The oxygen bleach comes as a granular powder that mixes with water.
Get rid of that grunge by cleaning your cedar siding with an.
I used double the concentration on mine because i got tired of scrubbing.
Leave the solution on the siding for about five minutes.
The side of the house with the least sun exposure can be the worst spot with the cedar developing mildew or mold that looks black.