The answer to 'when to clean pressure washing' is that you should pressure wash your home's exterior surfaces every 1-2 years, or more frequently if you notice visible dirt, mildew, or stains. Pressure washing helps remove built-up grime, restore the appearance of siding, walkways, and other outdoor surfaces, and prevent damage from weathering and environmental factors.
The optimal time to pressure wash is in the spring or fall when temperatures are moderate and there is less chance of the surface drying too quickly. Avoid pressure washing in direct sunlight or very hot weather, as this can cause the surface to dry too rapidly and leave water spots or streaks. It's also important to use the right pressure and nozzle settings to avoid damaging the surface.