By Baxter Overman | January 17, 2025 in 
The engine bay—that area under your hood—is important to keep clean even if not visible to strangers. In a practical sense, a clean engine bay will make checking oil or fluids much easier….because who wants a dusty mess every time you pop the hood?
I’ve been there. Plus, all the plastics and hoses tend to get less brittle over time if you protect them regularly.
Here are a few steps to follow to properly clean your car’s engine bay.
Step 1: Remove leaves and other loose debris
To start, pop the hood and remove any leaves or debris by hand around the windshield first. I like to use a crevice tool on my vacuum for these areas. You can also use an air gun attachment to a compressor if you have one. There are several benefits of using compressed air in detailing—like debris removal and powering steam cleaning guns for your interior.
Many people will tell you to grab a hose to start spraying water around the engine; in my opinion, it’s overkill to drench this area with water when you don’t have to. More of that later.
After all, if you clean this area regularly…heavy dirt buildup won’t be an issue.
Vacuum up loose dirt before using towels and cleaners
It’s not a bad idea to use a brush attachment with your vacuum to rake as much pollen or loose debris as possible from flat areas and covers. It might seem trivial, but if you suck up as much powdery dirt and debris as you can, your towels won’t get quite as clogged and dirty.
Consider using your older microfiber towels to clean under the hood. I don’t own a spotless show car, so it doesn’t make sense to use my best stuff under here.
Step 2: Apply a plastic and rubber cleaner using a brush
Next, use a set of detailing brushes for cleaning around hoses and crevices. I also like to use my worn-out detailing brushes if the engine bay is filthy. Use one dry brush to dust around areas like the battery, and another for applying cleaner.
I recommend adding cleaner to a brush first…because droplets (of anything) tend to dry quickly and leave behind water spots if sprayed directly on plastic covers.
Work hand in hand with a microfiber towel to remove any dirt the brush brings to the surface. I recommend a good heavy-duty vinyl and rubber cleaner like Meguiar’s M40 since it can be used on rubber hoses, plastic, and dirty foam trim.
Meguiar’s Heavy-Duty Vinyl/Rubber Cleaner & Conditioner
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In most cases, we don’t recommend spraying down the engine bay. In extremely dirty cases, you should cover areas like the alternator, fuse box, spark plugs, and any exposed wiring with a plastic bag. Modern cars are pretty water-resistant under the hood, but 99% of the time spot-cleaning with a brush and towel will give you the results you want.
Step 3: Finish with a trim dressing for aesthetic appeal
Once clean, you can apply a vinyl or rubber dressing on plastic areas for added shine. A product like Chemical Guys VRP works great as a last-step product; you can also use a trim dressing or tire dressing if you prefer.
Chemical Guys VRP
🏆 Our Budget Pick for Dressing Vinyl, Rubber, and Plastic
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It’s a good idea to clean under the hood every 2-3 washes and you can check fluids and filters while you’re at it.
The engine bay is one of the first areas I clean when washing a vehicle because it’s also one of the dirtiest. Since I can use many of the same cleaning sprays on rubber floor mats, tires, wheel wells, and the engine bay I generally clean these areas one after the other.
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