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Getting Rid of Paint Grime and Contamination

Most car owners make this harder than it needs to be. Here's the straightforward approach that actually works—no fluff, no upselling.

If your paint feels like sandpaper even after a wash, you've got contamination. Here is how to strip off the iron, tar, and Aussie red dust without wrecking your clear coat.

D"M
Dave "Davo" Mitchell Off-Road & 4WD Specialist
| Updated: 26 February 2026
What You'll Learn
Getting Rid of Paint Grime and Contamination

Aussie Conditions

Australian conditions are tougher than most—intense UV, red dust, coastal salt, and 40°C summers. European car care advice often doesn't cut it here.
Quick Summary

Look, even if you wash your car every weekend, there is stuff that just won't budge with a sponge. I am talking about iron filings from your brakes, sticky sap from that gum tree you parked under, and the lovely gift a bat left on your bonnet. This is a quick guide on how to get your paint smooth as glass again using a proper decontamination process.

01

Why Bother Decontaminating?

Most blokes reckon a bit of soapy water is enough, but truth be told, it barely scratches the surface. If you run your hand over the paint (use a plastic sandwich bag over your hand to feel it better) and it feels gritty, that's contamination. It's usually iron particles, industrial fallout, or red dust that's literally baked into the surface. If you don't get it off, it'll eventually oxidise and cause tiny rust spots. I learned this the hard way on a white Hilux I owned, ignored the little orange dots for a year and ended up having to machine polish the whole thing just to save it.

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Don't Work in the Sun

It's February in Oz, so it's bloody hot. Never, ever use chemical decontaminants in direct sun. If you spray an iron remover like Bowden's Own Wheely Clean or Meguiar's Iron Remover on a hot panel and it dries, it'll stain your trim or clear coat. Save this job for early morning or late arvo in the shade. If the panel is too hot to touch comfortably, it's too hot to work on.

Chemical Before Mechanical

Some people go straight for the clay bar, but I reckon that's a mistake. You want to use a dedicated iron fallout remover first. It reacts with the metal particles and turns purple, bleeding them off the paint. This does about 80% of the heavy lifting for you. After 15 years doing this, I've found that if you skip the chemical stage, you end up dragging more grit across the paint with your clay bar, which just creates more scratches (marring) that you'll have to polish out later.

The 'Clay Towel' Shortcut

Traditional clay bars are great, but if you drop one on the garage floor, it's rubbish, chuck it straight in the bin. For a daily driver, I usually use a clay mitt or towel instead. They're way faster and if you drop 'em, you just rinse 'em off. I used one on a mate's dusty LandCruiser after a Nullarbor trip and it saved me about two hours of work. Just make sure you use heaps of lubricant (soapy water or a dedicated clay spray).

Dealing with Bat Snot and Sap

If you've got those hard, baked-on yellow spots (bee pollen or sap), don't try to scrub them off with your fingernail. I've seen so many people gouge their paint doing that. Use a bit of isopropyl alcohol or a dedicated tar and sap remover. Let the product do the work. Dab it on, let it sit for a minute, and it should wipe away. Your partner will definitely thank you for not ruining the family car's finish.
02

The Decon Kit

What You'll Need

0/5
Iron Fallout Remover — Something like Gtechniq W6 or Bowden's Wheely Clean.
Clay Bar or Clay Mitt — Fine grade is usually enough for most cars.
Clay Lubricant — Don't be stingy with it! Use a dedicated spray or very slick car soap.
Tar Remover — Essential for those black spots behind the wheel arches.
Clean Microfibre Towels — At least 3-4 fresh ones.

Watch Out

Don't use dish soap as a lubricant, it's not slick enough and it'll dry out your rubber seals. Also, never decontaminate your paint if you aren't planning to put some wax, sealant, or ceramic coating on afterwards. This process strips everything off, leaving the paint 'naked' and vulnerable to the Aussie UV. Made this mistake myself on a black Commodore once, didn't protect it, and the sun started fading the boot within a month.
03

Common Questions

How often should I do this?
Honestly, once or twice a year is plenty for most cars. If it's a garaged show car, maybe once every two years. If it's parked under trees or near a train line, you might need to do it more often.
Will claying remove my scratches?
Nah, it won't. Claying only removes stuff sitting *on top* of the paint. If you want to get rid of scratches, you're looking at a machine polish. Claying is just the prep work for that.
Can I use water as a clay lube?
I wouldn't. Plain water doesn't have enough 'slip'. You'll end up dragging the clay and leaving streaks of clay residue (and scratches) all over the shop. Use a proper lube or at least some very sudsy car wash.

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