If this lightens the stain try exposing the stained section to the sun as much as possible for several weeks.
Black spots on marine vinyl.
Are your seats hard vinyl seats attached to the boat.
A solution made of bleach should work but if you need it to be environmentally friendly for disposing the cleaning solution into the lake river etc.
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.
If your boat is stored near lakes rivers and oceans this is often a given.
12 6 2018 cleaning vinyl boat seats there are few things more frustrating for a boat owner than mildew stains taking over your vinyl seats and comfy cushions.
Those black dots and blobs look unsightly may cause the crew to stand instead of sit and cause your boat to diminish in value.
Condensation that forms due to temperature swings can create a friendly environment for mold on your boat seats.
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.
Clr mold and mildew and mr.
So how do you remove mildew from boat seats.
How to clean mold mildew and black spots off vinyl boat seats.
Guess what the problem isn t with the vinyl.
We are not pointing fingers but this is usually the 1 reason marine vinyl breaks down.
The main characteristic that separates marine grade vinyl and regular vinyl is marine grade vinyl has uv protection and is mold mildew resistant.
The real problem is how the material is cared for and cleaned.
The solution used by most professionals for tough spots on vinyl is a 50 50 solution of boat clean plus and boat scrub.
I think you can use simple green.
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Try rubbing a small spot with this solution on a cloth or a small scrub brush.
Not only are the black spots unattractive but they can keep you from enjoying your time on board and even diminish the overall value of your boat.
Quick drops in temperature.