Or it could be that your wood clapboard lap or shingle siding simply needs a thorough cleaning.
How to clean cedar shingle siding.
Allow the bleach or citric mixture to sit for about 15 minutes.
Wearing your rubber gloves.
Test a small part of your siding to determine exactly what type of staining problem you are dealing with tannin or mildew.
Care for cedar shingles step 1 clean shingles step 2 refinish shingles step 3 repeat.
Cleaning cedar shingles brush the surface to remove dirt and debris with a long handled scrub brush or broom.
For the best results thoroughly inspect your western red cedar siding trim and or decking first for any damage mildew and dirt.
Pay special attention to areas where there might still be moss or lichen remnants.
The safe and effective way to clean the wood is oxygen bleach.
How to clean cedar shake siding.
Mix the oxygen bleach in a ratio of 2 cups of powdered granules to 1 gallon of water or based on the product and.
If necessary a stiff bristle non metallic brush can be used.
The cedar bureau recommends using a solution no stronger than one part bleach to three parts water.
Make any necessary repairs then clean the cedar with warm water and phosphate free soap.
Apply it with a pump sprayer and let it sit for about 15 minutes before rinsing it off with a garden hose.
This will protect plants from any possible damage to the greenery from bleach runoff.
The oxygen bleach comes as a granular powder that mixes with water.
Use a garden sprayer or similar device to spray the mixture on your cedar shingles.
Water any grass plants flowers or other foliage surrounding your cedar siding.
Mix the powdered bleach according to directions on the bottle such as 4 parts water to 1 part powder.
It is non toxic to trees and vegetation and will not remove natural color from the siding.
Make sure to get the entire surface of your cedar shingle roof.
Be sure to keep the hose pointed downward to avoid forcing water up behind the shingles.
Pour the mixture into a cleaned out lawn and garden sprayer.
Apply the solution with a clean garden sprayer allowing it to soak for 15 minutes.