The safe and effective way to clean the wood is oxygen bleach.
Best way to remove mildew from cedar siding.
I used double the concentration on mine because i got tired of scrubbing.
It is non toxic to trees and vegetation and will not remove natural color from the siding.
Re staining does not solve a mildew problem.
Mildew is a common form of discoloration of paints and stains caused by staining fungi.
Vinegar solution 30 vinegar to 70 water simple green.
It s also safe for plants that may inadvertently get dripped upon during the cleaning process.
To remove mildew from wood siding hardi plan or stucco use the following solution.
When it is time to refinish clean off the mildew with a mild bleach solution oxygen bleach is preferred or commercial mildew remover.
Choose a liquid concentrate such as scotts outdoor cleaner plus oxiclean 9 99 per gallon.
Less volatile than chlorine it removes mildew on and below the surface as well as algae dirt and oxidized paint but won t harm plants or clothing.
An alkaline cleaner such as washing soda or a cleaner containing trisodium phosphate can be added for extra cleaning.
1 quart household chlorine bleach must be fresh 3 quarts warm water.
Scotts which is easy to use in a garden sprayer or pressure washer.