Soft washing should be used for cleaning delicate surfaces such as roofs, painted surfaces, and siding, where high-pressure water might cause damage. For example, it's ideal for removing algae, mold, and mildew from shingles or cleaning painted wood without stripping the paint. Pressure washing, on the other hand, is best for tough, durable surfaces that can withstand high pressure, such as driveways, sidewalks, decks, and concrete patios, where it effectively removes stubborn stains and grime. By choosing the appropriate method for each job, you can achieve optimal cleaning results without compromising the integrity of your property.