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Old 04-01-2017, 04:54 PM   #1
Scooby Newbie
Member#: 440333
Join Date: Feb 2016
Default cleaning engine bay

so the exterior of my '13 looks clean but whenever i open the hood to check my oil and other stuff the thing is disgusting i wanna clean it but im kinda scared to at the same time, what should i use? (or can i just go to foam and wash?)
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Old 04-02-2017, 07:49 AM   #2
Scooby Newbie
Member#: 465046
Join Date: Mar 2017
Location: Yonkers, NY
2017 Impreza Sport
Crystal White Pearl


I have washed my toyotas engine bay and my miata engine bay. No issues at all. Just get that foam degreaser and spay it on and let it sit for a minute and then spray off. Also only wash with the motor cold not warm ok.

Edit: Try not to soak the alternator. You could cover it or just wash around it. Then wipe it clean by hand with a rag.
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Old 04-02-2017, 09:20 AM   #3
Scooby Newbie
Member#: 451697
Join Date: Jul 2016
Location: Virginia
1998 Outback Sport


Cover your alternator with a plastic bag. Doesn't have to be water tight, just enough to keep the majority of water off.

If you have an open air intake, stuff a bag in the opening to keep water out.

Spray liberally with a degreaser. Under the hood too, although not the fiberboard insulation if you have any.

Agitate with brushes anywhere you seem to have heavy build-up of grease.

Find a hose nozzle that has a mist setting. You don't want to use a pressure washer or a direct blast/stream. It's surprising how easy most of the dirt and grime will come off with just a little water pressure.

Blow dry with a shop vac or air compressor, wiping tough areas with a rag.

Add dressing if desired.

I've done hundreds of these!
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Old 04-02-2017, 11:54 AM   #4
Scooby Newbie
Member#: 365569
Join Date: Aug 2013
Location: 702 Vegas
2006 WRX STI
Aspen White


Purple power degreaser from walmart or parts store is my go to product for engine bay cleaning.

I dont really use a stiff/wire brush, i get my brushes from the dollar store. I use a toothbrush and a 2" wide paint brush to agitate stubborn areas.

Let the degreaser settle in a few minutes, but never wanting it to dry. Work in spots, rather the whole engine bay to prevent it from drying in areas where you wont be attacking while working in immediate area.

for dressing, use a soft sponge, rather spraying the whole engine bay like most people do, i spot treat plastic and some rubber parts with gel dressing on the sponge and apply it.

good luck!
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Old 04-03-2017, 07:11 PM   #5
Scooby Newbie
Member#: 460950
Join Date: Jan 2017

I've been wondering this for a while now as well as my engine bay looks like a beach (lineless wheel wells). Thanks for the tips guys!
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Old 04-03-2017, 08:20 PM   #6
Scooby Newbie
Member#: 421874
Join Date: May 2015
Chapter/Region: NESIC
2015 WRX STi
Dark Grey Metallic


Scrubbing Bubbles bathroom cleaner works really good.
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Old 04-03-2017, 08:46 PM   #7
NASIOC Supporter
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
2006 GT Ltd 5spd sdn
'15 WRX 6spd CWP, '02 WRX


Like others mentioned, these guys cover the alternator as well as the factory air intake, but that's about it.

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Old 04-05-2017, 06:42 PM   #8
Scooby Specialist
Member#: 358485
Join Date: Jun 2013
Chapter/Region: Tri-State
Location: Collegeville, PA

+1 for foaming bubbles and cheap dollar store brushes. Also +1 for plastic bag and rubber band over alternator and CAI
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Old 04-19-2017, 11:55 AM   #9
hybrid gti 2
Scooby Guru
Member#: 67004
Join Date: Jul 2004
Chapter/Region: SCIC
Location: (818) 300k+ ej205 ppg 5mt
02 vf30 pnp wagon
silver and cf


Try this. The military uses it. I used it and it's pretty impressive.

Spray Nine 22732 Grez-Off Heavy Duty Degreaser, 32 oz.
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