Wash & Rinse Technique by Surface: the full procedure

Match pressure, nozzle, and technique to each surface so you clean thoroughly without etching, streaking, or stripping.

• Applies to: Field Technician
• Frequency: Every job
• Scope: Covers nozzle/pressure selection and rinse technique per surface type. Surface-damage thresholds (etching, oxidation, wood fuzzing) defer to the product label and the business safety plan; default delicate surfaces to soft-wash.

What you need

• Nozzle/tip set (range of degrees)
• Surface cleaner attachment
• Soft-wash rinse setup
• Pressure washer
• Extension wand
• Water supply

The procedure, step by step

1. Match tip to surface — Select the widest-angle tip and lowest effective pressure that will clean the surface; never start with a narrow high-pressure tip on an untested surface.
2. Soft-wash delicate surfaces — Rinse siding, roofs, wood, and painted surfaces with low-pressure soft-wash technique only — let the chemistry, not the wand, do the work.
3. Use a surface cleaner on flatwork — Clean large concrete flatwork with a rotary surface cleaner for even results and to avoid wand stripes/zebra lines.
4. Keep consistent distance and angle — Hold the wand at a steady distance and angle, moving in overlapping passes so coverage is even and no zebra striping appears.
5. Work top-down on rinse — Rinse vertical surfaces from the top down so dirty water runs over still-dirty areas, not over already-clean ones.
6. Watch for surface reaction — Stop immediately if you see etching, oxidation pull, wood fuzzing, or coating lift, and reassess method. Damage thresholds defer to the safety plan.
7. Rinse fully and feather edges — Rinse until all chemical and loosened soil is removed and feather the edges so there are no hard clean/dirty lines.
8. Spot-check and re-treat — Inspect for missed spots and re-treat stubborn areas with chemistry and dwell rather than escalating pressure.

Quality check before you finish

• Widest/lowest-pressure tip that cleans effectively used
• Delicate surfaces cleaned by soft-wash only
• Surface cleaner used on large flatwork (no zebra lines)
• Consistent distance/angle, overlapping passes
• No etching, oxidation, or wood damage
• Edges feathered with no hard clean/dirty lines
• Stubborn spots re-treated with chemistry, not raw pressure

This is a free, source-anchored standard operating procedure (SOP) you can print and hand to staff. It documents the work sequence for a Pressure Washing business — not safety or regulatory rulings, which defer to the cited authorities, the applicable code, and your own health-and-safety plan. Open the tool above to print it, toggle ink-saver, or (with a free ToolFluency Business account) edit it to match your own workflow.

Sources

• PWNA (pwna.org)
• UAMCC (uamcc.org)
• This Old House (thisoldhouse.com)