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The split that matters most is how the water hits. Roofs, vinyl, stucco and painted trim get a low-pressure soft wash, a cleaning mix that kills the algae and mildew, then a gentle rinse. Concrete, pavers and bare wood can take more pressure, and that is where a surface cleaner and a wand earn their keep. Picking the wrong one is how shingles lose granules and water ends up behind siding.

Storefronts, sidewalks and lot flatwork for businesses run through the concrete page, since the equipment and the process are the same, just on a bigger footprint and usually early, before the doors open.

Which one do I need?

Start with what you are looking at. Black streaks running down a roof from the ridge are an algae, and what we do about those dark streaks explains why that never gets a pressure washer. Green film on the north side of the house, under the eaves or along the wall that faces the trees, is the same family of growth living on siding.

Yellow dust on everything in April is pollen. It settles on porch ceilings, screens, rails and window sills from March into May, and one wash once it stops falling takes it off without much fuss. Grey, fuzzy-looking wood on a deck or fence is weathering, and that calls for a different mix than wood that is just mildewed.

Dark rings and slick spots on a driveway or a shaded walk are mildew working into the concrete, and in this heat it tends to creep back within a year or two wherever the ground stays damp. Overflowing gutters with dark tiger stripes down the outside face are really two jobs, clearing the inside and brightening the outside.

Most houses are a mix, and that is fine. If the walls are the main worry, the write-up on vinyl and brick walls walks through how each one gets handled. Otherwise pick the closest page, or skip to the form and tell us what you see.