When it is time to refinish clean off the mildew with a mild bleach solution oxygen bleach is preferred or commercial mildew remover.
How to remove mildew from stained cedar siding.
After the wood has been thoroughly rinsed and allowed to dry refinish with a coating that contains an effective mildew cide.
Re staining does not solve a mildew problem.
These dark stains can be removed by wiping away any excess grease then dissolving the stain.
Chlorine can also damage foliage and stain clothing.
It appears to make mildew vanish but on porous surfaces such as wood or vinyl siding chlorine evaporates too quickly to get to the fungi s roots guaranteeing regrowth.
The oxygen bleach comes as a granular powder that mixes with water.
It is non toxic to trees and vegetation and will not remove natural color from the siding.
Oxygen bleach hydrogen peroxide.
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.
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.
The safe and effective way to clean the wood is oxygen bleach.