If this mixture doesn t remove all of the algae try a stronger solution using oxygen bleach.
Best way to clean algae off vinyl siding.
Try to stay away from using household detergents car wash soaps or chlorine bleach as these can leave films on your siding or cause permanent discoloration.
Apply some elbow grease.
It does really work in 30 seconds.
Work in sections so that you can complete the entire section before the solution dries.
It s a powdered substance that you mix with water.
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Chlorine can also damage foliage and stain clothing.
Make a solution with a couple of cups of dishwashing liquid and a bucket of water.
Oxygen bleach hydrogen peroxide.
How to remove algae from siding.
Starting at the top of the section apply the vinegar and water solution with a long handled scrub brush.
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Mix it according to the directions on the box.
Test a small area.
Clean vinyl siding with vinegar another way to clean your vinyl siding without a pressure washer to use a white vinegar and water solution.
Never let the soap solution dry on the siding.
The oxygen bleach will clean the vinyl without damaging your landscaping.
Dishwashing liquid can also do an excellent job of cleaning vinyl siding.
Step 5 rinse the cleaned sections of siding with a garden hose as you go to prevent the soap from drying on the vinyl.
Less volatile than chlorine it removes mildew on and below the surface as well as algae dirt and oxidized paint but won t harm plants or clothing.
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.
To prevent streaking start at the bottom and work up towards the top.
According to the vinyl siding institute the best way is to use a soft cloth or an ordinary long handled soft bristle brush.
Apply it to the siding scrub and wait for a few minutes before rinsing it off.
Mix your cleaning solution.
30 seconds outdoor cleaner.
Use a bristle brush attached to a long pole to apply the solution to your siding scrubbing hard to get the surface algae off.
Once again if you do not want to.
Take care to get as little soap as possible beneath the siding.
This item is tried tested and a winner.