Usually found on contractor grade siding.
Vinal siding bleeding.
This article discusses common causes of stains or discoloration found on vinyl building siding.
Rinse with water from top to bottom often as you go to avoid uneven drying and spotting.
The sun will heat up the nail heads and discolor the vinyl siding.
To prevent streaking start at the bottom and work up towards the top.
Though you want to scrub hard to get rid of the grime be gentle with the siding as too much pressure may crack it.
Vinyl siding stain diagnosis.
The spots or discolor on the vinyl siding are from nail heads behind the vinyl siding.
Oxidation can be cleaned from most vinyl siding but the process.
A chalky white substance on your vinyl siding and trim is caused by oxidation which occurs most often during damp or wet weather.
Since it was first introduced in the late 1950 s vinyl siding has gained popularity due to its versatility strength and ability to weather the elements.
According to the vinyl siding institute the best way is to use a soft cloth or an ordinary long handled soft bristle brush.
Dirt from rain splash up algae lichens mold moss or even smoke or chemical stains have different causes and different preventative measures.