How to Clean Your Engine Compartment (Safely and Effectively)

Whether you're prepping your vehicle for a car show, listing it for sale, or simply taking pride in your ride, a clean engine bay can make all the difference.

Note: This guide is written with all vehicle owners in mind, no matter what you drive.

Why Clean The Engine Bay?

• Makes it easier to spot small leaks and issues early

• Helps components stay cooler and function more efficiently

• Reduces wear on belts, pulleys, and wiring

• Improves resale value and shows pride of ownership

• And let’s face it, it just looks better

Step-by-Step Engine Compartment Cleaning Guide

1. Make Sure the Engine Is Cool

Never clean a warm engine. Let your vehicle sit overnight before cleaning. Spraying cold water on warm components can cause condensation inside electronics, leading to damage.

2. Protect the Air Intake

• Remove the air intake duct

• Tape off the throttle body opening with duct tape

• Remove or cover the air filter housing if needed

3. Choose a Good Cleaner

We recommend Greased Lightning, which lifts dirt without aggressive scrubbing. There are other safe underhood cleaners as well, just avoid citric acid-based products on coated parts (they can cause discoloration).

4. Apply Cleaner and Let It Soak

• Work in the shade when possible, or clean in sections

• Remove plastic engine covers to reach hidden areas

• Spray cleaner on the engine, inner fenders, and radiator area

• Let the cleaner soak for 10 minutes, keeping it wet the entire time

5. Rinse Gently, Not Forcefully

Use a standard garden hose. Avoid:

• Pressure washers (which can force water into sensitive areas)

• Steam cleaners (which can cause damaging condensation)

6. Dry It Out Thoroughly

• Use compressed air to blow off water

• Focus on areas under covers and around the alternator

• No air compressor? A leaf blower works too!

7. Final Touches That Go a Long Way

• Wipe down plug wires with silicone spray applied to a cloth- this repels moisture and restores shine

• Apply high-temperature grease to the hood latch

• Spray hood hinges with a lubricant like Superlube or LPS #1

💡 Bonus Tip:

If your vehicle allows it, remove the radiator cover for better access to the radiator and A/C condenser. You might be surprised how much debris collects up top and how much it affects cooling.

A clean engine compartment shows you care and it’s simple maintenance anyone can do.

Have questions about your setup or which products to use? We’re happy to help!