Bird Droppings on Solar Panels

Why droppings are such a problem

Droppings stick to glass and harden in the sun. Unlike dust, they are dense enough to stop light reaching the cells beneath. A cluster on one panel can affect more than that small area because of the way cells are wired in strings.

Droppings are also slightly acidic and contain grit, so scrubbing them dry can scratch the glass.

Safe ways to remove them

Droppings need softening with water first, then lifting with a soft brush or cloth rather than scraping. Harsh detergents, abrasive pads and pressure washers are best avoided. On most roofs, safe access is the bigger issue; working from a ladder on a pitched roof is risky.

Our DIY solar cleaning guide explains when cleaning from the ground is reasonable and when to call someone.

Hygiene when handling droppings

Bird droppings can carry bacteria and fungi. Wear gloves, avoid creating dust by dry brushing, and wash hands afterwards. Our pigeon droppings guide covers general safety precautions without making medical claims.

Anyone with a health condition that affects their lungs or immune system should take extra care or leave the job to others.

Why droppings keep coming back

If droppings return within weeks, birds are probably perching on the ridge above, the panel frames or a nearby aerial, or nesting under the panels. Pigeons in particular are drawn to the warm, sheltered gap beneath arrays.

Look for feathers, twigs or debris at the panel edges, or birds flying in and out from under the array. Hearing scratching or cooing on the roof is another clue.

Cleaning plus proofing

Where birds are nesting under panels, fitting mesh around the array keeps them out of the gap and greatly reduces droppings. Spikes or other deterrents may help on perching points nearby. Proofing is timed to avoid active nests, because wild birds and their nests in use are protected.

Our solar panel pigeon proofing service explains the approach in general terms.

What to expect after a clean

Once droppings are removed, panels look clear and light can reach the cells again. If birds remain, droppings return. If the panels are proofed at the same time, the gap underneath can be cleared of nesting debris, which also lowers fire and drainage risks from piled material.

Gutters below the array often need clearing too, as debris from nests tends to slide into them.

Droppings on the ground below

Birds on a roof do not only foul the panels. Droppings collect on patios, paths, cars, windowsills and garden furniture beneath. This mess is often what prompts owners to look up and realise birds are living under the array.

Our pigeon droppings guide covers safe clean-up at ground level.

Gulls versus pigeons

Pigeons are the most common birds under panels, but gulls can also foul arrays, especially near the coast or landfill sites. Gulls are larger and tend to perch on ridges and chimneys rather than nest under panels.

The deterrent approach differs for each; see our gulls on roofs guide.

What we look at during a visit

When cleaning panels with heavy droppings, we look at the edges for gaps birds could use, check for twigs and feathers under the array and note any damage to cabling or frames visible from our working position. We also look at the gutters below.

That information is shared with you afterwards, so you can decide whether proofing is worthwhile. Nothing is added without your agreement.

Getting help

Send photos of the panels and any signs of birds. We can quote for solar panel cleaning and proofing in the same visit if needed. Quotes are free.