Pressure washing uses mechanical force. It belongs on concrete, pavers, and hard masonry where the surface can take it — driveways, sidewalks, patios, and dumpster pads.
Soft washing uses chemistry. It belongs on everything that can be damaged by force: asphalt shingles, vinyl and Hardie siding, stucco, painted wood, screens, fences, and outdoor furniture. Using pressure on those surfaces is how homeowners end up with cracked panels, stripped paint, and shingle granules in the gutters.
A professional exterior cleaning company should be using both, chosen surface by surface. Anyone who cleans a roof or siding with high pressure is doing damage you will pay for later.