Dish washing soap can be used instead of laundry detergent.
Black stains on vinyl siding.
For tough spots like paint drips tar and pencil and pen marks use a nonabrasive bathtub cleaner or nylon scrub pad.
The black stains on the vinyl siding shown at left may be a fungus or a black agae.
Clean tough stains off with a nonabrasive cleaner or a homemade vinyl siding cleaner of soap and water that won t damage the surface of the vinyl.
Before attempting to remove stains it is best to clean the area with a general cleaner.
Scrub the area with a scrub brush and the solution.
Pour the cleaning solution into a power washer.
Although it s most often found on the east coast it can grow anywhere and especially thrives in areas that have cool damp springs or rainy fall weather conditions.
You basically have to stay on top of it remove any tree branches that are up against it make sure your waterspouts or gutters aren t keeping it wet a lot and ask at the hardware if there is anything you can apply to slow down growth.
Over time and through repeated changes in weather vinyl siding will attract and develop mold or.
If you are worried about damaging the vinyl you may use a lower pressure pump sprayer.
The black tar like spots that are all over your vinyl siding are more than likely a fungus called sphaerobolus stellatus better known as artillery or shotgun fungus.
Begin by spraying a 5 foot wide section of the siding from the ground to the top.
Thankfully regular maintenance of your vinyl siding is fairly straightforward and simple.
But testing is probably not justified.
How to clean spots on vinyl siding general cleaning tips.
By the growth pattern we think this is almost certainly a dark colored algae.
Never use chlorine bleach to remove insect stains as it will seep into the ground and kill the roots of any vegetation in the area.
Remove insect stains from vinyl siding with simple cleaners.
Remember not to angle the sprayer upward to keep the solution from seeping under the siding layers.
A microscopy lab examination of a sample from this surface would be needed to know for sure.