Metal siding is going to be more prone to rust as well as stains.
Water spots on siding.
We get significant rainfall along the gulf coast where i live and that leads to a lot of siding problems.
Such markings may be normal.
If you notice lots of tiny black or dark brown spots developing on your siding above a landscaped area of your yard as seen below it is most likely artillery otherwise known as shotgun fungus.
Occasional rinses and spot treatments for mold or mildew will keep vinyl siding looking good for years.
A prime location for this type of staining is the bottom section of cedar or other wood house exterior siding that has come into contact with soil.
To remove the water spots try spraying some vinegar on them.
But even in dryer parts of the country lawn sprinklers that routinely wet siding or shrubs growing too close to the house to allow sufficient air circulation also lead to damaged siding.
Hard water stains are ugly but not impossible to remove.
Start pressure washing your house from the bottom up in small sections using a side to side motion and steady pace to prevent streaking.
Cleaning mold from vinyl siding.
Wood siding requires treatment for prolonged life.
Simple bleach solutions applied to the stain and then brushed away will return the vinyl to a state close to its original look.
Wood siding should be treated with some form of sealant such as paint stains or a clear sealant.
Rinse with a hose or buckets of water.
Water stains on wood siding are often caused by dirt that has wicked up from dirty water puddles or wet soil.
An upward spray can force water behind vinyl siding causing more problems for you as mold and mildew could grow in these wet spots.
Still you should test the spot removal methodology on a scrap of the siding or in an out of the way area in case it affects the color.
Look above the water streak for a drain opening that is permitting condensate to drain off from the back side of the building siding ouit onto the siding exterior surface.
Often washing the wood clear of the embedded soil is enough to clean it.
Bleach solutions usually break down stains on vinyl siding easily.
What causes water damage.