Bird droppings on car paint: what to do in the first ten minutes
By Sam W - SoapX Ltd.
A bird dropping can leave a dull mark in car paint surprisingly fast in warm weather. The fix is simple: get it off soon, get it off wet, and never scrub. Here is the method and the reasons behind it.
Why bird droppings mark paint
The usual explanation is acid. Lab tests by a UK car care maker, reported in 2011, point to heat as the bigger cause. Test deposits that were strongly acidic, neutral and strongly alkaline all did much the same damage.
What happens is this. Warm paint lacquer softens and expands. As it cools it hardens again and moulds itself around the dried deposit sitting on top. The surface is left slightly uneven, so it scatters light and looks dull or etched.
Two things make it worse: time and temperature. The longer a deposit sits, and the hotter the panel gets, the harder the mark is to shift.
What to do straight away
- Wet it. Soak a clean, soft microfibre cloth in water and lay it over the deposit. Do not wipe yet.
- Wait. A fresh deposit softens quickly. A dried one can need about ten minutes under the wet cloth.
- Lift, do not drag. Pinch the cloth up and away from the paint. Droppings can hold grit and seeds, and dragging them across the panel scratches it.
- Repeat with a clean side. Fold the cloth and go again until nothing is left.
- Rinse and dry. Flush the area with clean water and pat it dry.
- Wash your hands. Bird droppings can carry disease. Wash the cloth by itself before it goes near paint again.
What not to do
- Do not scrape it off dry. No fingernails, no plastic cards, no kitchen scourers.
- Do not rub. Pressure grinds the deposit into the lacquer.
- Do not reach for household cleaners. Vinegar, washing up liquid, glass cleaner and bicarbonate of soda can dull paint or strip its protection.
- Do not leave it for wash day. Time and heat do the damage.
If a mark is left behind
Wash the panel as normal and look at it dry, in good light. A faint dull patch sits in the surface of the lacquer, and a light polish may reduce it. Our polish and seal guide covers how. A deep, rough mark is a job for a professional detailer or a body shop.
Does wax or sealant help?
A little. The same tests found that wax and polish give limited protection against the mark itself, but they do make the deposit easier to remove. Easier to remove means off sooner, which is what matters. Top up your protection once the spot is clean.
Keep a kit in the car
A small bottle of water and a clean microfibre cloth in the boot is enough. The best time to deal with a bird strike is the moment you find it.
Quick answers
How long do I have?
There is no fixed time. Heat and time do the damage, so a deposit on a hot panel in summer wants dealing with the same day, and sooner if you can.
Is it really the acid?
Acid gets the blame, and many guides still say so. The tests above found little difference between acidic, neutral and alkaline deposits, and pointed to heat and time. Either way the advice is the same: remove it soon and remove it wet.
Does the colour of the car matter?
Dark paint in direct sun gets hotter, and heat drives the damage. A dark car parked in the sun is the worst case.
Should I wash the whole car afterwards?
You do not have to. Clean the spot, rinse it and carry on. Give the panel a proper clean at your next two bucket wash.
Who keeps doing this?
We have two suspects. See the Enemies List.
Kit for this job
- Laser Edgeless Buffing Cloths
- Chemical Resistant Trigger Bottle 500ml, filled with clean water
- No.05 Contact Shampoo for the wash afterwards
- No.08 Wax and Sealant to top up protection
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