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Bird Droppings
Quick answer: Bird droppings are the acidic, often sticky mess birds leave on your car. If they are not removed quickly, they can stain or even etch into paint and soft tops, leaving permanent marks.
While droppings can be highly corrosive and cause damage to paintwork, fabric hoods tend to be more resistant to damage. They are excellent fertilizer and provide all the nitrates and trace elements for fast growth of moss, algae and lichen.
If you park your convertible under a tree, the same can be said for any organic debris which falls on your car. Keep our soft top well maintained, cleaned and weatherproofed.
What it means
Bird droppings are the white, grey or multicoloured splats birds leave on cars. They are a mixture of uric acid, digested food and other waste, which dries onto the surface. On paintwork they often form a crust with a darker centre. On fabric and mohair roofs they soak into the fibres and can leave pale or dark stains even after cleaning.
Why it matters
Paint is not the only surface droppings damage, and it fails differently from the others. Acids and dyes soften clear coat under sunlight, so the deposit lifts off and leaves an etch mark or a dull patch behind; light examples polish out, deeper ones reach the point where local repainting is the only thing that hides them. Fabric roofs and textured plastics stain instead, in light or dark patches that resist removal because the material will not tolerate the chemicals or the abrasion that would shift them.
Timing decides which of those you are dealing with. What would have wiped away on day one bites deeper for every warm day it sits there, and on dyed fabrics the outcome at the far end is recolouring or replacement rather than correction. That makes prompt gentle removal worth far more than any product bought afterwards.
Where droppings land
Bonnets, roofs, mirrors and any flat surface under a perch collect them; on convertibles the soft top and rear deck take the worst. Inspection and detailing reports note bird droppings on bonnet, bird etching in lacquer or bird stains on soft top, often with a view on whether the mark will polish out.
Context
Bird droppings are one of several everyday contaminants - along with tree sap, tar and fallout - that can damage paint and roof materials if left. Modern clear coats are relatively thin, so there is only so much that can be polished away before you risk thinning the lacquer too far. Protective coatings, waxes and sealants can help slow down etching and make clean-up easier, but they are not invincible if droppings are baked on for weeks. On fabric roofs, careful cleaning and rinsing as soon as possible offers the best chance of minimising staining. Our workshop keeps a dedicated bird dropping remover to hand for exactly this situation; the sooner droppings come off, the more likely it is that a thorough wash and a polish resolves it without a trip to the bodyshop.
Common mistakes
- Leaving bird droppings on the car for days or weeks, especially in hot sun, then being surprised when a permanent mark remains.
- Picking or scraping at hardened deposits with fingernails or tools, scratching the paint or damaging roof fabric.
- Trying to remove severe etching with repeated heavy polishing on the same spot, thinning the clear coat to a risky level.
- Assuming a ceramic coating makes the car immune - coatings buy time and make clean-up easier, but even coated cars should have bird mess removed as soon as practical.