Surface Type Determines the Cleaning Method
Concrete, siding, decks and masonry do not all tolerate the same pressure. The goal is to remove dirt or organic buildup without damaging the material underneath.
Before cleaning, identify loose paint, soft wood, cracked mortar or other vulnerable areas. Aggressive pressure should not be used simply because a machine can produce it.
House, Deck, Concrete and Hardscape Areas
Siding can need a gentler wash than a concrete walk. Decks may require preparation appropriate to a later stain, while pavers can lose joint material if cleaned carelessly.
The project should therefore be divided by surface rather than treated as one uniform pressure setting across the property.
Sensitive areas such as loose siding, open joints, weathered wood and damaged mortar should be identified before cleaning. The safest method is the one appropriate to the weakest surface in the work area, not simply the highest available pressure.
Cleaning vs Repair or Refinishing
Washing can improve appearance and prepare a surface, but it cannot repair rot, cracked masonry or failing paint.
If the next step is staining a deck or painting the exterior, those finish services should be planned separately. Cleaning is most useful when the underlying surface is sound enough to be exposed without revealing a larger repair problem.