Bird droppings on a porch are a common nuisance. The acidic nature of bird waste, particularly the uric acid component, can etch and stain various porch materials if left untreated. Learning how to safely and effectively remove these deposits is important for maintaining the appearance and longevity of your porch surfaces. This guide provides practical methods for cleaning bird droppings while prioritizing personal safety and long-term prevention.
Safety and Initial Preparation
Cleaning bird droppings requires caution because the dried material can harbor infectious agents. Bird droppings can contain the fungus Histoplasma capsulatum, which causes the respiratory illness histoplasmosis when inhaled as airborne spores. Other pathogens, such as the bacteria responsible for psittacosis, can also be present.
Before disturbing the droppings, put on personal protective equipment (PPE), including heavy-duty rubber gloves and an N95 respirator, to minimize the risk of inhaling dust and spores. Thoroughly wet the droppings with a low-velocity mist of water or a mild cleaning solution. This prevents the dried material from becoming aerosolized, which is the primary way fungal spores become airborne and pose a health risk.
Allow the wetted droppings to soak for 10 to 15 minutes to soften the hardened material. This reduces the need for aggressive scrubbing that could damage the porch surface. Once softened, gently scrape up the bulk of the waste using a plastic scraper or cardboard and immediately place it into a durable plastic bag for disposal.
Cleaning Techniques for Different Porch Materials
Concrete/Stone
Porous materials like concrete and natural stone are susceptible to staining and etching from the uric acid in bird droppings. For these durable surfaces, a more aggressive cleaning agent is often required to break down the residue and lift the stain. A solution of equal parts white vinegar and water is effective, as the mild acidity helps dissolve the droppings and neutralize odors.
Apply the vinegar solution generously to the stained area and let it sit for about 10 minutes. Use a stiff-bristled brush to scrub the area in a circular motion, applying firm pressure to work the solution into the pores of the material. For particularly stubborn stains, apply a paste made from baking soda and water, allow it to fizz, and then scrub it away.
Wood/Decking
Wooden porches and decks require a gentler approach to avoid splintering the wood grain or stripping protective sealant. Avoid harsh chemicals or high-pressure washing, as they can damage the wood. Use a mild, pH-neutral soap, such as dish detergent mixed with warm water, as the cleaning agent.
Apply the soapy water to the affected area and use a soft-bristled brush or a sponge to gently scrub the droppings away. The goal is to lift the residue without gouging the wood surface, which is especially important for softer woods like cedar or pine. After scrubbing, rinse the area thoroughly with a garden hose on a low-pressure setting to remove all soap residue and prevent a slippery film from forming.
Composite/Vinyl
Composite and vinyl decking materials are the easiest to clean because they are non-porous and resistant to staining. These surfaces typically require only a simple solution of warm water and mild dish soap. Avoid using abrasive cleaning pads or stiff brushes, which can scratch the surface and dull the finish.
Apply the mild soap solution and use a soft cloth or a soft-bristled brush to wipe the area clean. While these materials are durable, it is important to avoid using strong solvents or bleach-based cleaners unless specifically approved by the manufacturer, as these can sometimes cause discoloration or damage to the composite binding agents. A quick rinse with a hose is usually sufficient to leave the surface clean and residue-free.
Sanitizing and Future Prevention
After the physical waste has been removed, sanitizing the area eliminates any remaining bacteria and fungal spores. An effective disinfectant is a diluted bleach solution, typically mixed at a ratio of one part household bleach to nine parts water. Apply this solution to the cleaned surface and allow a contact time of at least 10 minutes to ensure proper disinfection before rinsing it away.
To prevent the problem from recurring, implement non-toxic deterrents to discourage birds from landing on the porch.
Visual Deterrents
Visual deterrents, such as hanging reflective tape, old CDs, or small mirrors, create flashes of light that birds find disorienting.
Physical Barriers
Physical barriers, such as installing bird spikes on railings or ledges, or using fine netting to block access to overhead rafters, make the area uncomfortable for birds to perch or nest.