10 Clever Uses for WD-40 Around Your Car

WD-40 isn’t just for squeaky door hinges – it's one of the most versatile problem-solvers in any garage. Whether you’re driving a daily runabout, kitted-out 4WD, or performance car, this humble spray can help with everything from rust prevention to smooth window tracks.

1. Free Up Rusted Bolts and Nuts

Struggling with a bolt that just won’t budge? WD-40’s penetrant formula works its way deep into rusted threads, helping you break the bond and get moving again. It’s a lifesaver when working on suspension installs, exhaust swaps, or anything underneath that’s copped a bit of weather.

The WD-40 Specialist Fast Release Penetrant (300g with Smart Straw) works fast to loosen seized parts, with a straw nozzle for tight spots – perfect for weekend fixes or stubborn underbody bolts. Grab the 3-pack if you’re a regular DIYer.

The CRC Penetr 8 High Speed Penetrant (400g) is what you need for something tougher. It’s built for heavy-duty jobs and comes in a 6-pack – ideal for workshop pros or rust-prone vehicles.

2. Stop Door and Bonnet Hinges from Screeching

That ear-piercing creak every time you open the door isn’t just annoying – it’s also a sign those hinges are drying out. A quick spray of WD-40 Multi-Use is usually enough to silence the squeak and keep corrosion at bay, especially after rain or coastal exposure.

If you’ve got a few cars or plan on using it around the house too, grab the 425g Multi-Use bulk cans (single or 6-pack) for better value. Need something compact? The 150g version is glovebox-friendly and perfect for quick fixes.

For longer-term protection or stickier hinge jobs, the WD-40 Specialist Fast Release Penetrant Lubricant is a solid upgrade – great for older vehicles or hinges with visible rust buildup.

3. Remove Bug Splatter and Road Grime

After a long highway haul, your front end’s likely coated in bug guts, tar, and road grime. WD-40 Multi-Use Product makes short work of stubborn gunk. Just spray it on, let it sit for a minute, then wipe clean – no need to scrub like mad.

It’s safe on most paints and trims, just be sure to rinse the area after and reapply your wax or sealant if needed. For repeat use or larger cleanups, consider the 425g bulk can or the 4-litre container for even better value.

4. Clean and Protect Battery Terminals

Dirty or corroded terminals can affect voltage, especially on newer cars loaded with electronics. A blast of WD-40 clears away grime and leaves behind a water-resistant coating to slow future corrosion. 

Corroded battery terminals can mess with your voltage and trigger electrical gremlins – especially in modern cars packed with sensitive electronics. Start with a spray of WD-40 Specialist Fast Drying Contact Cleaner to safely clean grime and corrosion without leaving residue. It’s non-conductive and evaporates quickly, making it ideal for electrical components.

For heavier buildup, hit the area first with the WD-40 Specialist All Purpose Citrus Degreaser, a water-based cleaner that cuts through oil and grease without being harsh on surrounding materials.

Once clean, follow up with a light spray of WD-40 Multi-Use to leave a protective barrier that helps repel moisture and slow future corrosion. It’s a simple trick that can help avoid no-start dramas.

5. Prevent Rust Underneath Your 4WD

Been through the beach, a river crossing, or a muddy track lately? A quick spray of WD-40 Multi-Use on your diff housings, tow points, bash plates, and chassis welds helps displace moisture and offers short-term rust protection. It’s especially handy when you’re out touring and can’t get to a proper washdown right away. Just remember – this isn’t a substitute for a deep clean and underbody protection, but it’ll buy you time until you can get it sorted.

6. Keep Door and Boot Seals in Good Nick

Dried-out rubber seals can crack, squeak, or even freeze shut in colder areas. WD-40 Specialist Silicone Lubricant restores softness and keeps weather seals pliable, preventing wind noise and water leaks. It’s a small job that makes a big difference in comfort.

7. Help Slow or Sticking Power Windows

Spraying WD-40 Specialist Silicone Lubricant along the inside of the window tracks (with the glass down) can ease resistance and help the motor glide smoothly again. Just be sure to clean up any overspray.

8. Repel Mud Before You Hit the Track

Spray WD-40 Multi-Use Product on your wheel wells, control arms, or recovery points before a muddy run. It forms a temporary barrier that helps stop mud from sticking, making post-trip cleaning way easier. Just steer clear of brakes and rubber bushes.

9. Dry Out Damp Electrical Connections

If your car’s been through heavy rain, or you’ve just crossed a river, your spark plugs or trailer wiring might start acting up. WD-40 stands for “Water Displacement, formula 40” – it literally forces moisture out of contacts. Use it to revive damp coil packs or sensors in a pinch.

For more delicate or modern electrical systems, WD-40 Specialist Electrical Contact Cleaner offers a fast-drying, residue-free alternative.

10. Protect Tools and Recovery Gear from Rust

Leave your tools or snatch gear in a ute tray or canopy for long enough, and you’ll see surface rust creeping in. WD-40 Multi-Use Product is a classic for a reason – it prevents oxidation on metal gear like spanners, jacks, and D-shackles. Give everything a spray before storing, especially if your gear gets exposed to salt or moisture.

Your Go-To Car Parts Store for WD-40 and More

From freeing bolts to protecting your gear, WD-40 earns its spot in every glovebox and garage. At Superspares, we stock the full range of WD-40 products – plus thousands of essentials for keeping your car in top condition.

As a trusted car parts store serving Aussies nationwide, we make it easy to grab what you need online and get it shipped fast. Whether you're a weekend tinkerer or full-time 4WD tourer, your next fix might just start with a can of WD-40.