Soffit Cleaning
Soffit cleaning is washing the underside of the roof overhang, the panels that close the gap between the wall and the roof edge. Soffits collect dust, cobwebs, algae, and insect nests, and many are vented, so they must be cleaned gently, without forcing water into the attic or clogging the openings.
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In depth
Because the soffit sits under the eaves, rain rarely rinses it, and growth builds unnoticed until the house looks dirty up high. A low-pressure soft wash with detergent, applied from below at a safe angle and followed by a rinse that does not saturate the vents, is the usual method. Aluminum and vinyl soffits clean easily, while wood soffits need extra care to avoid soaking. Clean vents also help attic ventilation, which matters for moisture and ice dams in winter.
How this shows up on our jobs
Soffits, fascia, and trim are part of our overhead soft wash, areas many companies skip. Doing them together with the siding makes the whole house look finished.
Services where this matters
Frequently asked
- What is Soffit Cleaning?
- Soffit cleaning is washing the underside of the roof overhang, the panels that close the gap between the wall and the roof edge. Soffits collect dust, cobwebs, algae, and insect nests, and many are vented, so they must be cleaned gently, without forcing water into the attic or clogging the openings.
- How does Soffit Cleaning show up on our jobs?
- Soffits, fascia, and trim are part of our overhead soft wash, areas many companies skip. Doing them together with the siding makes the whole house look finished.
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Related terms
Soft Wash
Soft washing is a low-pressure exterior cleaning method that uses biodegradable detergents and a controlled bleach solution to kill the algae, mold, mildew, and bacteria that cause staining — rather than scouring them off with brute force. A soft wash rig delivers cleaning fluid at roughly 60-200 PSI, comparable to a strong garden hose, which is safe on siding, shingles, painted surfaces, screens, and caulking. The chemistry does the work: the solution dwells on the surface, breaks down the organic growth at the cell level, and is then rinsed clean with fresh water.
Fascia Board
The fascia board is the horizontal board running along the lower edge of the roof, to which gutters are typically fastened. It covers the ends of the roof rafters and gives the roofline a finished appearance. In wood construction, fascia is typically 1x6 or 1x8 pressure-treated or painted pine; in newer construction, it is often PVC or fiber cement. Because it is exposed to constant moisture from gutters, drip, and snow melt, the fascia is one of the most rot-prone boards on a home.
Fascia Rot
Fascia rot is decay of the fascia board, the trim board that runs along the roof edge and holds the gutter, caused by repeated wetting. Wood fascia soaks up water from overflowing gutters, leaking seams, ice dams, and missing flashing, and it softens, darkens, and eventually crumbles.
Dwell Time
Dwell time is the interval between applying a cleaning chemistry to a surface and rinsing it off. It is the single most misunderstood variable in exterior cleaning. Chemistry does not clean instantly; it needs time to break chemical bonds, kill organisms, or dissolve minerals. Too little dwell and the chemistry is wasted. Too much dwell — especially in direct sun — and the chemistry can damage the surface, bleach landscaping, or drive the stain deeper.
Post-Treatment
Post-treatment is any chemistry or protective step applied after the primary cleaning to neutralize residual cleaning agents, extend the result, or seal the surface against future staining. On wood decks cleaned with percarbonate (alkaline), a dilute oxalic-acid brightener is the post-treatment — it neutralizes the cleaner and restores the wood's natural pH and color. On concrete cleaned with an acid wash, a baking-soda or alkaline rinse post-treats the surface to stop the acid reaction. After soft washing siding, a thorough fresh-water rinse is the post-treatment to remove bleach residue before it contacts plants or metals.