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.
Oxygen bleach to clean cedar siding.
To safely remove stubborn stains dissolve the oxiclean in water according to package directions and apply the solution to the wood siding.
The safe and effective way to clean the wood is oxygen bleach.
Apply one coating of oxygen bleach to the darkest stained areas first then coat the entire shingled surface with the spray.
If necessary a stiff bristle non metallic brush can be used.
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.
Make any necessary repairs then clean the cedar with warm water and phosphate free soap.
Put on a pair of heavy duty rubber gloves because you are about to deal with bleach which can prove highly irritable.
The oxygen bleach comes as a granular powder that mixes with water.
When you add a bit of this sodium percarbonate or sp powder to water it reacts by releasing the trapped oxygen from the peroxide.
How to clean cedar siding with bleach 1.
If there is mold or mildew brown or black spots it needs to be killed with a commercially available mildew killer cleaner or warm water and oxygen bleach.
Allow it to sit for 15 minutes then rinse it off thoroughly.
Follow this by spraying another coat of the oxy bleach onto the darker stains.
Dry the siding first if you notice signs of mold growth.
It is non toxic to trees and vegetation and will not remove natural color from the siding.
You can dry wood siding using a dehumidifier or a space.
Spray the oxygen bleach mixture onto the shingles.
To make oxygen bleach cleaners hydrogen peroxide is added to soda ash to produce a granular powder known as sodium percarbonate.
I used double the concentration on mine because i got tired of scrubbing.
Chlorine bleach weakens wood fibers increasing the wear and damage to the wood.