The best way to get rid of the stains is to prevent them.
How to remove mulch stains from vinyl siding.
Add a fresh layer of mulch.
Could see the old clapboard of some sort along with some plain styrofoam and tin foil like insulation.
I just bought a 1940 house that had vinyl siding installed about 20 25 years ago.
Replace wood mulch with landscape fabric and small stones.
Peroxide hydrogen peroxide has also been said to work especially at higher strengths.
Mouthwash mouthwash is something many swear by for cleaning artillery fungus off of vinyl siding especially mint laced varieties.
And so i want to remove the vinyl.
The stains come from a weird clear looking fungus that grows on mulch.
Plant a low maintenance groundcover in the area instead of using mulch.
The vinyl siding institute yes there really is such an organization offers some helpful and specific tips for dealing with stubborn moldy spots on your siding.
Vinyl looks to be in okay shape i just prefer wood.
The artillery fungus grows in wet times of the year on mulch and looks kinda like clear water and whitish strings.
Scrub the wood stain from the vinyl siding with a soft sponge.
Put on rubber gloves.
Mix 3 4 cup of oxalic acid granules and 1 gallon of hot water.
I peeled back a corner piece yesterday and peeked inside.
Store bought cleaners such as windex will usually do the job for these kinds of spots but if you want to make your own chemical free solution you can use a natural mixture of vinegar and water.
Apply it allow it to bubble and then brush it off with a wet scrub brush or sponge.
At the end of the string is a piece of something that looks like black peppers.
Use ammonia cleaners or a solution of one part bleach in four parts water to clean mold and mildew stains.
Use big pieces of pine bark or other bark mulch which are a less hospitable place for the fungus.
The product can be bought a local wal mart.
However never mix ammonia and bleach rinse thoroughly while the siding is still wet.
This will buy you a year before the fungus reaches to the top of the new mulch.
Don t use paint thinner nail polish remover spot removers paint remover straight chlorine bleach or furniture cleaner on vinyl.