If using a brush brush the siding s surface dust or dirt then rinse the area with a garden hose.
Cleaning solutions for painted siding.
In addition many liquid dishwashing soaps would work for minor cleaning of pre painted roofing or siding.
Years ago the only solution on how to clean vinyl siding would be to rent or own a pressure washer or scrub the siding with a soft brush and garden hose to remove mold from the siding.
Start at the bottom to avoid streaking and use your garden hose to rinse off each section before it dries.
The cloth will likely come up dark gray with a layer of fine soot.
Manual cleaning is preferred.
For a stronger solution mix.
As an experiment rub a clean white cloth across the unwashed siding.
Basic vinyl siding cleaning apply the vinyl siding cleaning solution with a soft bristle cleaning brush scrubbing the full length of each lap.
This detergent solution should be made from a tri sodium phosphate for example the laundry detergent name brand spic n span.
70 water 30 white vinegar makes a great all purpose vinyl siding cleaner that removes light mold and mildew stains.
Vinegar and water solution natural siding cleaner 3 1 2 cups vinegar 1 2 gallon of water.
Though far gentler than a pressure washer pivotpro is broadly similar in the sense that it releases a steady directed stream of water.
If using a soft cloth wet the cloth then wipe the area in a side to side motion in the direction of the plank shingle or panel siding until clean.
So before you begin cleaning the siding in earnest take.
From there rinse the area with clean water.
Even after pressure washing you may still find that a thin layer of dirt remains on the siding.
Some good vinyl sider cleaner solutions include.