What this covers
Roof cleaning removes the dark streaks, moss, algae and lichen that grow on shingles, tile and shake, most often on shaded and north-facing slopes. A careful company uses soft washing: a low-pressure spray of a cleaning solution that kills the growth, followed by a gentle rinse, because high-pressure washing strips shingle granules and forces water under tile. The crew works from staging or in fall protection, protects plants, siding and windows below, and clears the loosened debris from the gutters and downspouts when it is done.
When to call
- Dark streaks or stains running down the roof slope.
- Green moss or crusty lichen growing on shingles, tile or shake.
- Gutters filling with moss, grit or granules after rain.
- A roof inspection or a sale that calls for a clean roof surface.
What to expect
- Roof checkThe crew checks the roof material, its condition and any damage before anything is cleaned.
- ProtectPlants, siding, windows and outdoor surfaces below are wetted, covered or shielded.
- Soft washA low-pressure solution is applied from staging or a harnessed position and left to work.
- Rinse and clearThe roof is rinsed gently, gutters and downspouts are cleared, and you see the result.
Get a certified company
Look up a certified company by ZIP code. Every company's license, insurance and trades are verified before it is listed, and placement is never paid.
Questions people ask
Why not pressure wash a roof?
High pressure can strip the protective granules from shingles, crack tile and drive water under the roofing. Soft washing uses low pressure and a cleaning solution instead.
Does cleaning fix leaks?
No. Cleaning removes growth. If the crew sees loose, cracked or missing roofing during the work, a roofer looks at the repair separately.
How long does a clean roof stay clean?
It depends on shade, moisture and the roof material. Shaded roofs in damp climates grow back sooner, so some homes are cleaned every few years.
Related: Roof repair · Gutter cleaning · Roof inspection · All roofing and gutters
This page describes what the service involves. The company you hire sets the scope, the schedule and the price, and your contract is with that company. We verify credentials and collect reviews from real jobs. We do not guarantee any company's workmanship. Safety steps are general guidance. When in doubt, leave the home and call 911.