What You'll Learn
Aussie Conditions
Look, I get it. The engine bay is a mess of wires, sensors, and expensive-looking bits that seem like they'd hate water. But after 15 years in the trade, I can tell you that a filthy engine bay is actually worse for your car, especially with our harsh conditions. This guide covers how to safely degrease and detail your engine, whether you've just come back from a dusty trip out West or you're trying to find a pesky oil leak.
Why Bother Scrubbing Under the Bonnet?
The Gear You'll Need
What You'll Need
While you're here...
Preparation is Everything
Cool it down
Never, ever spray cold water on a hot engine block. I learned this the hard way on a black Commodore back in the day, you risk cracking the manifold or worse. The engine should be cool to the touch or just slightly warm.
The 'Leaf Blow'
Before any water touches the car, use your leaf blower or a vacuum to get rid of loose leaves, twigs, and dead bugs. They just turn into a soggy mess otherwise.
Cover the electrics
Wrap your alternator, exposed air intake, and any aftermarket alarm sirens in plastic bags. Secure them with tape or a rubber band. If you've got an old-school car with a distributor, cover that too.
The Step-by-Step Clean
Dry Brush
Give the heavily soiled areas a quick once-over with a dry brush to loosen the thick stuff.
Apply Degreaser
Start from the bottom and work your way up. Generously spray your degreaser over everything except those covered electrics. Let it dwell for 5-7 minutes, but don't let it dry out (especially in our 40-degree heat).
Agitate
This is where the magic happens. Use your detailing brushes to scrub the grime. Focus on the valve covers, plastic shrouds, and the firewall.
Rinse Gently
Using a 'mist' or 'shower' setting on your hose, rinse from back to front. You don't need 3000 PSI here; you're just flushing the soap away.
Inspect
If there's still grease (usually near the battery tray or oil cap), hit it again. Some spots might need a second go.
Initial Dry
Remove your plastic bags and use the leaf blower to blast water out of spark plug wells, electrical connectors, and bolt holes.
Towel Dry
Wipe down the flat surfaces with your microfibre towels. This prevents those ugly water spots.
Dress the Plastics
While the engine is still a tiny bit damp, spray your dressing over the plastic and rubber. This makes them look brand new and prevents them from cracking in the Aussie sun.
Run the Engine
Close the bonnet and start the car. Let it idle for 5-10 minutes. The heat from the engine will finish drying any moisture you missed.
Final Wipe
Open the bonnet one last time and wipe away any excess dressing for a nice, matte factory finish.
Watch Out
Pro Tip: Dealing with Red Dust
Keeping it Clean
Common Questions I Get Asked
Will I void my warranty if I clean the engine?
Can I use dish soap?
How often should I do this?
What if my car won't start after the wash?
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