Vinyl siding needs cleaning just like other parts of your home. Relying on rain as a means of cleaning your siding is insufficient. One common problem that plagues your vinyl siding is the droppings of flies. As flies sit on your siding all throughout the spring and summer, they leave droppings behind which will make your siding look dirty. Couple that with tree pollen and dust and your siding can get really dirty quick.
Turn off outdoor lights and power outlets. Close all windows and doors that lead to the outside.
Cover shrubbery and flowers with plastic sheeting to protect them from the cleaning solution.
Mix together a solution of dish soap and hot water in a bucket. Use enough dish soap to create a sudsy solution.
Pour the solution into a pump-up sprayer. Spray the solution on a section of siding. Spray down at the siding to prevent water from getting up and under the siding.
Dip your soft brush in the soapy water solution and gently scrub the siding. Use side-to-side motions to lift the fly droppings and other dirt from the surface.
Rinse the siding with your garden hose to remove the soapy water residue and fly droppings.
Move on to the next section and repeat the process.
Always start at the top and work your way down. Gravity will help pull the fly droppings down to the ground.
Don't use any harsh chemicals or bleach to clean your siding. The chemicals will likely damage your grass and plants.