How to remove tree sap and bird droppings from your car

Why you shouldn’t leave them

Bird droppings are acidic and full of grit. In the sun, paint heats up and expands, then contracts as it cools — and a dropping baked on through that cycle can leave a dull, etched mark in the clear coat. In a Melbourne summer that can happen within days.

Tree sap doesn’t usually eat into paint the same way, but it hardens and bonds to the surface, and it’s easy to scratch the paint trying to get it off. Both are easiest to deal with fresh.

Removing bird droppings

1. Don’t wipe it dry. The grit in a dropping acts like sandpaper if you drag it across the paint.
2. Soften it. Soak a microfibre cloth in warm water, or use a quick detailer spray, and lay it over the dropping for a few minutes.
3. Lift, don’t scrub. Pinch the cloth and lift the dropping away. Turn to a clean side and repeat until it’s gone.
4. Rinse or wash the panel so no residue is left behind.
5. Check in good light. A dull patch the shape of the dropping is etching — see below.

If the car lives under a roost, keep a microfibre cloth and a small spray bottle of water in it. Thirty seconds on the day beats a polish later.

Tree sap or honeydew?

Not every sticky spot under a tree is sap. Often it’s honeydew — a sugary liquid dropped by aphids and other sap-feeding insects living in street trees. It feels tacky, collects dust and can turn black with sooty mould if it’s left, but fresh honeydew usually comes off in a normal wash with car shampoo.

Real sap is different: it sets into hard, glassy beads that a wash won’t shift.

Removing hardened sap

1. Wash the car first so you’re not grinding dirt around the area.
2. Use a dedicated tar and sap remover, or isopropyl alcohol on a microfibre. Test it on an inconspicuous spot first.
3. Let it soften. Hold the dampened cloth against the sap for a minute, then gently lift. Repeat — patience beats pressure.
4. Never scrape with a fingernail, a blade or the scourer side of a sponge. That’s how sap removal turns into paint repair.
5. Wash the panel again. Solvents strip any wax or sealant from that spot too.

What if there’s a mark left?

A dull patch or ring after the deposit is gone is etching in the clear coat. Washing can’t remove it — it needs machine polishing (paint correction). We don’t offer polishing, so if that’s what your car needs, see a paint correction specialist. Light etching can often be polished out; deep etching sometimes can’t be removed completely.

Keeping on top of it

• Wash more often if the car lives outside under trees — our guide to how often to detail your car has a realistic schedule
• Remove droppings the day you see them, especially in summer
• If you have the choice, don’t park directly under a tree birds roost in
• Paint with a layer of protection (wax, sealant or coating) releases droppings and sap more easily — worth considering if the car always lives outside
• Don’t put a cover on a dirty car — grit trapped under it scratches the paint

Kerbside cars in Melbourne’s inner north

If your car lives on the street in Brunswick, Northcote, Thornbury, Coburg or Carlton, it’s fighting this all year. Our exterior hand wash — snow foam pre-wash first, then a two-bucket wash — lifts fresh droppings and honeydew without dragging grit across the paint, and it’s part of every $150 full detail. Got hardened sap or old droppings? Mention it when you book so we know what we’re dealing with.