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Stop Ignoring Your Engine Bay: Quick Tips for a Clean Motor

Your car's interior cops more abuse than you realise—UV damage, spills, body oils, and the occasional fast food disaster. Here's how to fight back.

Most people forget the engine bay until something breaks, but keeping it clean stops salt and red dust from eating your components. Here is how to get it sorted without frying your electronics.

B"W
Barry "Bazza" Williams Product Reviewer
| Updated: 17 March 2026
What You'll Learn
Stop Ignoring Your Engine Bay: Quick Tips for a Clean Motor

Aussie Conditions

Australian UV is 15% stronger than Europe. Your dash and leather need proper UV protection, not just cleaning, especially if you park outside.
Quick Summary

Look, I get it, cleaning the engine bay feels like a recipe for disaster if you've never done it. But after 15 years in the trade, I've seen more damage from gunk and coastal salt than I ever have from a bit of water properly applied. This guide is for the bloke who wants a tidy bay without spending all Saturday on it. It's especially vital if you've been up the coast or out in the red dirt lately.

01

Why Bother?

Most Aussies only pop the bonnet to check the oil or when the steam starts pouring out. Big mistake. If you live near the coast, that salt spray gets sucked through the radiator and sits on your aluminium bits, causing white corrosion. If you've been out west, that red dust acts like sandpaper on your belts and pulleys. Honestly, a clean engine runs cooler and makes it way easier to spot a leak before it leaves you stranded on the side of the Bruce Highway.

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Never Clean a Hot Engine

I learned this the hard way on a black Commodore years ago, sprayed degreaser on a scorching manifold and it baked on instantly. Total nightmare to get off. You want the engine warm to the touch (so the grease softens), but not 'servo pie' hot. If you can't rest your hand on it comfortably, leave the bonnet up for 20 minutes and grab a cold one while you wait.

Cover the Sensitive Bits

Modern cars are pretty well sealed, but don't risk it. Grab some supermarket cling wrap or plastic bags and chuck them over the alternator, the air intake, and any exposed fuse boxes. Use a rubber band to hold 'em tight. A customer once brought in a Hilux that wouldn't start because he'd high-pressure blasted his intake, cost him a fortune in sensors. Just cover them up, it takes two minutes.

The Right Chemicals Matter

Don't just use whatever's under the kitchen sink. My go-to for years has been Bowden's Own Orange Agent or Meguiar's Super Degreaser. If you've got heavy red dust from a trip to the Red Centre, you'll need a soft brush to agitate it. Spray it on, let it dwell for 4-5 minutes (don't let it dry!), and give the greasy spots a bit of a scrub with an old paintbrush.

Ditch the Pressure Washer

You'll see blokes at the DIY car wash blasting their engines with the high-pressure wand. Don't be that guy. That pressure forces water past seals and into connectors where it shouldn't be. Use a garden hose on a 'shower' setting. It's more than enough to rinse away the grime without causing an electrical headache. Trust me on this one.

The Finishing Touch

Once it's dry (I use a leaf blower to get water out of the nooks and crannies), hit the plastic bits with a water-based dressing like Aerospace 303 or Autoglym Vinyl & Rubber Care. Avoid the cheap, oily 'tyre shine' sprays, they look great for five minutes but they attract dust like a magnet. You'll end up with a muddy mess next time you hit a dirt track.
02

What You'll Need

What You'll Need

0/5
Quality Degreaser — Get a pH neutral one if you have lots of polished aluminium.
Detailing Brush — A cheap 2-inch paintbrush from Bunnings works perfectly.
Plastic Bags/Cling Wrap — To protect the alternator and air intake.
Microfibre Towels — Use old ones you don't mind ruining.
Plastic Dressing — Non-greasy is the way to go.

Watch Out

NEVER spray cold water onto a scorching hot engine block, you risk cracking the metal. Also, stay away from 'engine glazes' that are flammable. I've seen a bloke nearly torch his engine bay because he used a cheap solvent-based shine that ignited on the exhaust manifold.
03

Common Questions

How often should I do this?
Honestly, twice a year is plenty for most people. If you do a lot of beach driving or off-roading, give it a quick rinse after every trip to stop the salt and dust from settling.
Do I need to leave the engine running?
No, keep it off while cleaning. Once you're finished rinsing and you've pulled the plastic bags off, start it up and let it run for 10 minutes. The heat from the engine will help evaporate any leftover moisture in those hard-to-reach spots.
Will this void my warranty?
Cleaning your engine won't void your warranty, but drowning your ECU in water might make the dealer grumpy. Stick to the 'low pressure' rule and you'll be fine.
04

Wrap Up

Right, so that's the gist of it. It’s not rocket science, just takes a bit of common sense and the right gear. Give it a crack next time you're washing the car, the missus will be impressed when she sees how shiny it is under the hood. And yeah, that's pretty much it.

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