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Detailing Techniques intermediate 4 min read

Degreasing the Beast: Engine Bay Cleaning Checklist

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

Don't let red dust and salt air bake onto your engine components. Here is exactly what you need to safely clean your bay without frying the electronics.

MT
Mick Thompson Senior Detailing Editor
| Updated: 18 March 2026
What You'll Learn
Degreasing the Beast: Engine Bay Cleaning Checklist

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, most blokes are terrified of hosing down their engine, but it's easier than you think if you follow a system. I've spent 15 years cleaning everything from dusty Hiluxes to salt-crusted beach cruisers, and I've only ever had one car not start (a 90s Jag, go figure). This checklist is designed to get your bay looking factory fresh without the stress. Just make sure the engine is cool before you start, seriously.

01

The Essential Gear

What You'll Need

0/8
A decent degreaser — Stay away from the cheap harsh stuff. I reckon Bowden's Own Orange Agent is the best for Aussie conditions, it's tough on grease but safe on plastics.
Soft-bristle detailing brushes — Get a couple of different sizes to reach between the intake and the firewall.
Microfibre towels (the ones you don't care about) — Don't use the missus's good house towels, engine bays are filthy.
Aluminium foil or cling wrap — Essential for covering up the bits that hate water.
Low-pressure hose or pressure washer — If using a pressure washer, keep your distance. Don't go blasting the electrical connectors up close.
Compressed air or a leaf blower — The best way to get water out of the nooks and crannies before it spots.
Engine dressing/protectant — Carpro Perl or Meguiar's Hyper Dressing. Makes the plastics look brand new.
A stiff tyre brush — Good for scrubbing the metal bits and the underside of the bonnet.

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02

Pre-Start Checklist

What You'll Need

0/4
Engine temperature check — Can you comfortably touch the intake manifold? If not, wait. I once saw a bloke crack a manifold by spraying cold water on a hot engine, not pretty.
Cover the sensitive bits — Wrap the alternator, exposed air filters, and any loose electrical plugs in foil.
Check the battery — Make sure the terminals are tight. No dramas if they get a bit wet, but we don't want water sitting inside the casing.
Remove loose debris — Clear out any dry leaves or gum nuts stuck near the wipers. They trap moisture and cause rust.
03

The Step-By-Step Process

Tap each step to mark complete
01

Dry Brush and Vacuum

Before adding water, brush out the loose red dust and vacuum it up. Adding water to thick dust just creates mud that hides in corners.

02

Apply Degreaser

Spray from the bottom up. Focus on the oily areas near the block and the underside of the bonnet. Let it dwell for 3-5 minutes, but don't let it dry.

03

Agitate with Brushes

Use your detailing brushes to work the degreaser into the grime. Pay attention to the fluid reservoirs and plastic covers. This is where the magic happens.

04

Rinse Gently

Use a light mist to rinse away the dirt. Start from the back of the bay and move forward. Avoid direct high-pressure spray on sensors or the fuse box.

05

Dry Thoroughly

Chuck your leaf blower on high and blast water out of all the electrical connections and spark plug wells. Use microfibres to dry the flat surfaces.

06

Protect and Dress

Apply a water-based dressing to the plastic and rubber hoses while they are slightly damp or dry. It'll prevent them from cracking in the Aussie sun.

04

Final Inspection Checklist

What You'll Need

0/4
Remove all foil/covers — I've definitely forgotten a bit of foil on an alternator before. It makes a hell of a noise when you start it up.
Check for standing water — Look deep down in the engine valley. Use a towel to soak up any puddles.
Start the engine — Let it run for 10 minutes. The engine heat will help evaporate any remaining moisture you missed.
Wipe down the edges — Clean the inner guards and the slam panel so the whole bay looks uniform.

Watch Out

NEVER use silicone-based 'tyre shine' in your engine bay. It’s a massive fire risk and it attracts dust like a magnet. Also, if you've got an older car with a distributor cap, cover that thing like your life depends on it, they hate water more than a cat.

Quick Tip

If you've been doing a lot of beach driving, mix some 'Salt-Away' into your rinse water. It neutralises the salt spray that builds up on your aluminium bits and prevents that white corrosion.

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Related Topics

engine bay detailing engine degreasing car engine cleaning engine bay dressing safe engine wash