The best method and solution to clean the outside of your house is a low-pressure chemical "soft wash" technique utilizing a biodegradable house-washing detergent mixed with surfactants and mild mildewcides. Using a garden hose or a low-pressure setting on a pressure washer, apply the specialized cleaner from the bottom up, let it dwell for ten minutes to break down organic algae, dirt, and pollen, and then rinse thoroughly from top to bottom with clean water without damaging siding.
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