That green stuff is mold mildew or algae and if you leave it long eno.
Bleach to clean cedar siding.
Oxygen bleach removes algae mold and mildew from cedar restoring much of the wood s natural beauty.
I live in a house with vinyl siding.
It is non toxic to trees and vegetation and will not remove natural color from the siding.
How to clean cedar siding with bleach 1.
I used double the concentration on mine because i got tired of scrubbing.
Once those products soak into the cedar and the sun beats down the almost bake in the sun it causes extreme drying making the shingles or shakes dry thin and brittle.
The oxygen bleach comes as a granular powder that mixes with water.
Cleaning vinyl siding with bleach water.
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.
It s also safe for plants that may inadvertently get dripped upon during the cleaning process.
Dry the siding first if you notice signs of mold growth.
Water any grass.
With cedar wash cedar siding and roofing shingles come out uniformly clean.
Oxygen bleach is non damaging both chlorine and oxygen bleach have great anti microbial qualities that allows them to clean and disinfect the surfaces they are applied to.
Put on a pair of heavy duty rubber gloves because you are about to deal with bleach which can prove highly irritable.
The north side of the house is always in the shade.
The safe and effective way to clean the wood is oxygen bleach.