Frequently asked questions

Every 1–2 years for most homes. Moss and algae grow year-round in Western Washington, and waiting longer than two years usually means heavier buildup and longer treatment time. Homes under heavy tree cover or with north-facing roofs may need annual cleaning. AWP Exterior Cleaning recommends scheduling roof cleaning before moss lifts shingle edges and accelerates granule loss.

Yes. Soft washing uses low pressure — about the same as a garden hose — and relies on cleaning solution dwell time to break down growth. High-pressure washing strips granules off shingles, forces water behind siding, and voids most roof warranties. Soft washing is the only method recommended by shingle manufacturers. AWP Exterior Cleaning uses soft washing on all roofs and siding across Greater Clark County.

Yes. Any company applying moss treatment or moss-control products in Washington must carry a commercial pesticide applicator license from the Washington State Department of Agriculture. AWP Exterior Cleaning's technicians are licensed in both Washington and Oregon, apply EPA-registered products, document application rates, and follow state re-entry intervals.

Most single-family homes take 2–3 hours depending on square footage and number of stories. Two-story homes take longer than single-story ranches because AWP uses extension poles and works more carefully around upper windows and eaves. The crew cleans windows, eaves, and fascia as part of the house wash.

Pricing is based on square footage for house washing and roof cleaning, linear footage for gutters and fences, and per-window count for window cleaning. AWP Exterior Cleaning can give accurate pricing over the phone if you know your home's square footage, or the crew will measure on-site during a free estimate.

Not required as long as AWP has access to the exterior and a way to reach you by phone. The crew will send before-and-after photos when the job is done. If they're cleaning interior windows or need access to a locked gate, someone needs to be home.

Twice per year — late fall after leaf drop and late spring after seed and flower drop. Homes with overhanging conifers may need a third cleaning. Skipping fall cleaning leads to ice dams in winter; skipping spring cleaning means overflow during May and June rains. AWP Exterior Cleaning handles gutter cleaning across Greater Clark County year-round.

AWP pre-treats oil stains with degreaser and hot water, which lightens most stains significantly. Fresh oil stains come out; old stains that have soaked deep into porous concrete may lighten but won't disappear completely. Concrete absorbs oil below the surface, and no amount of surface cleaning will pull it back out.

Concrete can handle 3,000–4,000 PSI without damage. Wood decks and fences require much lower pressure to avoid splintering and grain lifting — AWP uses soft washing or controlled-pressure rinsing depending on wood type and age. Composite decking tolerates moderate pressure but still needs care to avoid surface etching.

Yes. If you're not satisfied with the results, let AWP Exterior Cleaning know within 48 hours and the crew will come back to address the issue at no charge. The business stands behind every job across Greater Clark County.

AWP Exterior Cleaning accepts cash, check, and card. Payment is typically due on completion. Invoicing by email with online payment options is available if arranged in advance.

Light rain is fine for most exterior cleaning — surfaces are already wet. AWP reschedules for heavy rain, high wind, or ice. If you need to cancel or move your appointment, call at least 24 hours ahead.