According to the vinyl siding institute the best way is to use a soft cloth or an ordinary long handled soft bristle brush.
Best way to remove algae from vinyl siding.
On top of that you need a vinyl siding cleaner that fits with your pressure washer and does the cleaning with ease.
Trisodiium phosphate per two gallons of water.
Generally use lb.
Choose a cleaning solution that is appropriate for the type of growth you have on your siding.
Water stains remove with a mild detergent and water.
A pressure washer will definitely give a better point in cleaning.
Refer to the label on the trisodium phosphate for specific mixing instructions.
Stains on wood cleanse with mild detergent mixed with water.
If it does not mix a solution of one part chlorine bleach to four parts water to clean the siding.
Spray the siding with water from the garden hose to remove loose dirt and debris.
Mildew and algae on vinyl and wood use a solution made of oxygen bleach not chlorine bleach mixed with water.
A chemical solution is necessary.
Chlorine can also damage foliage and stain clothing.
Step 5 rinse the cleaned sections of siding with a garden hose as you go to prevent the soap from drying on the vinyl.
Step 2 dip a long handled soft bristled scrub brush into the cleaning solution.
To prevent streaking start at the bottom and work up towards the top.
It appears to make mildew vanish but on porous surfaces such as wood or vinyl siding chlorine evaporates too quickly to get to the fungi s roots guaranteeing regrowth.
Oxygen bleach hydrogen peroxide.
Take care to get as little soap as possible beneath the siding.
Use a brush to scrub the algae from the surface of the vinyl siding.
Hard stubborn mildew or algae is tough to remove with only pressure washing.