Whether you need soap depends entirely on the surface you are cleaning and the type of dirt involved. If you are merely rinsing loose dust, mud, or light pollen off concrete or siding, plain high-pressure water can suffice. However, if you are battling stubborn mildew, greasy stains, organic algae, or embedded grime, using a specialized pressure washer detergent is essential because soap chemically breaks down bonds, disinfects surfaces, and reduces the need for dangerous high-pressure water.
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