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