Steps to remove the spots.
How to remove fly specks from vinyl siding.
Add a fresh layer of mulch.
If using a bowl wring out the paper towel so it s not dripping.
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Combine equal amounts of white vinegar and water in a bowl or spray bottle.
Wet a paper towel with the solution.
Mouthwash mouthwash is something many swear by for cleaning artillery fungus off of vinyl siding especially mint laced varieties.
Apply it allow it to bubble and then brush it off with a wet scrub brush or sponge.
I would use something like jomax siding cleaner and a pressure washer light stroke.
Dirt and insect secretion stains however can adhere to vinyl siding attracting molds mildews and algae.
Though you may be stuck with a few black speckles for a while here s how you can keep the fungus from shooting any more spores at your house.
Apply the jomax with a pump up sprayer let is set a minute then pressure wash or brush it in and use a hose to rinse it down.
Test the solution on a small hidden area of the surface first if needed to be sure it is safe such as for a painted wall.
Use big pieces of pine bark or other bark mulch which are a less hospitable place for the fungus.
Insect stains and other debris can be removed by simply cleaning vinyl siding with household cleaners.
This will buy you a year before the fungus reaches to the top of the new mulch.