Bird droppings and tree sap: why they wreck paint and what to do

The chemistry working against your paint

Bird droppings contain uric acid, and London's pigeon output is concentrated wherever branches overhang parking bays. As a dropping dries it does two things: the acid bites into the lacquer, and the drying crust contracts and pulls at the surface. The result is the classic ghost mark: a dull outline that stays after the mess is long gone.

Tree sap works slower but harder. Lime and plane trees, the standard issue on London avenues, drip sticky honeydew from late spring. Fresh, it is a nuisance; baked through a few hot weeks, it polymerises into a resin bonded to the paint that a mitt slides straight over.

Safe removal, in order

For droppings: soak first. Lay a wet cloth over the mark for a few minutes, then lift it away gently. The residue is gritty, and dry scrubbing turns it into sandpaper. For fresh sap: a normal hand wash usually lifts it. For hardened sap: targeted treatment, typically a clay bar pass, which removes bonded contamination without cutting the paint.

What never works: fingernails, dry tissues, and the cash-machine receipt scrape. All three trade a two-minute problem for a permanent one.

The London prevention routine

Cars that live under trees need washing more often, not less: the point is that nothing acidic or sticky gets a fortnight in the sun. A regular gentle hand wash is the whole defence for most cars, and it is exactly what Yikes delivers at the kerb, wherever the car is parked.

For cars that sleep under a favourite pigeon perch, add a sacrificial layer. Wax helps for a season. A 2 year ceramic coating (£270, £216 members, paint correction included) makes droppings and sap sit on the coating rather than the lacquer, and rinse off far more easily.