If your siding is especially grimy you may want to consider renting a pressure washer to blast the worst of the dirt and gunk off first.
Good cleaning solution for siding.
This solution removes less stubborn mold or mildew from the siding.
For tough spots like paint drips tar and pencil and pen marks use a nonabrasive bathtub cleaner or nylon scrub pad.
After rinsing apply a cleaning solution to the siding.
Use ammonia cleaners or a solution of one part bleach in four parts water to clean mold and mildew stains.
How to wash vinyl siding as a low maintenance building material vinyl is just as easy to wash with a garden hose and a powerful vinyl siding cleaning solution as it is with a pressure washer.
Take an adequate amount of soap and mix it with warm water to make a soapy solution one part soap to ten parts water.
However never mix ammonia and bleach rinse thoroughly while the siding is still wet.
Not only does it fight mold and mildew growth but it works wonders at leaving siding squeaky clean.
Rinse the siding with clear water to remove dirt and dust that has accumulated on its surface.
One of the best cleaning agents to try is vinegar.
It is the simplest method at your disposal.
Mix 70 water and 30 white vinegar to make a good all purpose vinyl siding cleaner.
To use any siding cleaning solution begin by rinsing your siding with regular water using your gardening hose.