Unlike interior painting–which allows for some leeway with cleaning–you must clean your house's siding before painting. There's just no way around it.
As an experiment, rub a clean white cloth across the unwashed siding. The cloth will likely come up dark-gray with a layer of fine soot. Even after pressure washing, you may still find that a thin layer of dirt remains on the siding.
Paint applied to dirty siding will adhere in the short term. But over the years, your house will experience paint failure faster than if it were applied to clean siding. So, washing the siding is always recommended.
Read More: https://www.thespruce.com/cleaning-house-siding-before-exterior-painting-1821938
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