Bird Dropping Removal
Bird dropping removal is cleaning bird feces from roofs, siding, windows, solar panels, and walkways before the acid in it damages the surface. Droppings are acidic and hold moisture, so left in place they etch glass and paint, stain porous stone, and carry bacteria that can make people sick.
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In depth
Fresh droppings wipe away with water and a soft cloth. Dried ones must be re-wetted and softened with detergent before scrubbing, which keeps dust from going airborne. Heavy buildup around eaves, ledges, and commercial entrances is a hygiene and liability problem, not just a cosmetic one, and cleaners should wear protective gear. Prevention means removing nesting sites and food sources and using spikes or netting. Cleaning alone only resets the clock.
How this shows up on our jobs
Lakefront Madison properties and commercial entrances with ledges see the most pigeon, goose, and starling mess. Droppings on solar panels also cut output until they are rinsed off.
Services where this matters
Frequently asked
- What is Bird Dropping Removal?
- Bird dropping removal is cleaning bird feces from roofs, siding, windows, solar panels, and walkways before the acid in it damages the surface. Droppings are acidic and hold moisture, so left in place they etch glass and paint, stain porous stone, and carry bacteria that can make people sick.
- How does Bird Dropping Removal show up on our jobs?
- Lakefront Madison properties and commercial entrances with ledges see the most pigeon, goose, and starling mess. Droppings on solar panels also cut output until they are rinsed off.
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Related terms
Solar Panel Cleaning
Solar panel cleaning is rinsing dust, pollen, bird droppings, and film off the glass of photovoltaic panels with purified water and a soft brush, using no soap. Dirt on the glass blocks sunlight and lowers output, while the wrong cleaner or a stiff brush can damage the anti-reflective coating or void a warranty.
Organic vs. Inorganic Stain
Organic stains are caused by living or once-living things: algae, mold, mildew, lichen, tannins from leaves, berry drip, insect excretion, pet urine, and so on. They contain carbon and respond to oxidizing chemistry — sodium hypochlorite or hydrogen peroxide (percarbonate) — which breaks the carbon bonds and destroys the stain at the molecular level. Inorganic stains are mineral-based: rust, hard-water deposits, efflorescence, metallic irrigation over-spray, fertilizer streaks, and the like. They contain no carbon and will not respond to bleach at all — you need an acid or a chelating agent to dissolve the metal or mineral and carry it away.
Biocide
A biocide is any chemical agent that kills living organisms — bacteria, fungi, algae, mold, mildew, lichen. In exterior cleaning, the most common biocides are sodium hypochlorite (bleach), quaternary ammonium compounds ("quats"), and hydrogen peroxide. Each has a place: sodium hypochlorite is the fastest and most cost-effective broad-spectrum kill; quats provide residual antimicrobial action that slows regrowth on treated surfaces; peroxide is the mildest and is used where chlorine would damage the substrate.
Pre-Treatment
Pre-treatment is the application of a cleaning chemistry to a surface before the primary wash — typically to break down, dissolve, or kill a specific stain or organism before pressure or soft-wash techniques complete the removal. On oil-stained concrete, an alkaline degreaser is the pre-treatment; on algae-covered siding, a diluted soft-wash solution applied 10-15 minutes before the final rinse is the pre-treatment; on rust-stained stone, an oxalic acid application pre-treats the iron deposits that pressure alone won't lift.
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.