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#4741337 - 04/28/18 10:12 AM Engine Bay Cleaning
NewEnglander Offline


Registered: 01/14/15
Posts: 80
Loc: Boston, MA
Would appreciate advice on best methods to clean the engine bay. I wouldn't say mine is awful but it could certainly use some attention. It strikes me turning the hose on and blasting everything is less than ideal for a series of electrical reasons, but using a smaller brush on every inch also seems like less efficient. Probably some balance in the middle but would love to hear how everyone approaches keeping their engine bay looking just as good as the rest of the car!
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#4741344 - 04/28/18 10:32 AM Re: Engine Bay Cleaning [Re: NewEnglander]
BHopkins Offline


Registered: 11/03/13
Posts: 1087
Loc: Utah
Yes, I also would be interested in hearing how others handle this. I've seen videos of people that spray down the entire engine bay with a protectant such as Aerospace 303, let it set for some time, and then hose off all the excess.

But my Outback Owner's Manual specifically advises to not wash the engine compartment. I have always followed that advice. But just recently cleaned all plastic surfaces, such as the air cleaner box, fuse box, intake manifold, strut tower caps, etc., with Aerospace 303. It does look much better, but it still doesn't look like what I have seen from engine bays that have been detailed professionally.

On other cars, I've washed engine bays at the car wash before, but have always been careful to avoid the alternator. I'm just not convinced that this is the best practice.
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2013 Subaru Outback 2.5i - Royal Purple 0W-20 & NAPA Gold filter
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#4741345 - 04/28/18 10:34 AM Re: Engine Bay Cleaning [Re: NewEnglander]
funkymonkey1111 Offline


Registered: 02/07/18
Posts: 89
Loc: Englewood, CO
Plenty of pro detailer how-to vids on youtube.

https://www.youtube.com/watch?v=1YnfDyOhHsc&feature=em-uploademail

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#4741351 - 04/28/18 10:41 AM Re: Engine Bay Cleaning [Re: NewEnglander]
JamesBond Offline


Registered: 12/13/06
Posts: 843
Loc: midwest
I remove the engine covers then cover the alternator, fuse box, throttle body electrical stuff and anything else that looks expensive or not well sealed with grocery store bags, saranwrap and rubber bands. Then spray the dirty areas with degreaser, and the painted areas with car wash soap in a spray bottle, and scrub with an old sock. Rinse with the hose, then I blast it with compressed air or put the hose from the vacuum cleaner on the exhaust side and use the crevice tool, to get rid of large amounts of water. Then remove the plastic bags and start immediately. Drive with ac on until totally dry, usually some highway, followed by some idling and more highway.

I've had issues with water getting in spark plug holes on a couple of cars that don't have the bolt down cops, but blasting out the hole with air solves this, and always drive until totally dry.


Edited by JamesBond (04/28/18 10:45 AM)

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#4741356 - 04/28/18 10:51 AM Re: Engine Bay Cleaning [Re: NewEnglander]
WobblyElvis Offline


Registered: 09/23/14
Posts: 1303
Loc: Toronto Canada
I was told by an auto detailer that cleaning an engine was something you should never do. He did it for a living but thought it lead to corrosion and other problems. It sure would be nice to have a clean engine but I just live with the dirt. I live in the rust belt, maybe it's a different story in other environments.

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#4741357 - 04/28/18 10:54 AM Re: Engine Bay Cleaning [Re: NewEnglander]
MasterSolenoid Offline


Registered: 09/26/17
Posts: 143
Loc: One Step Beyond
I washed my engine a couple times with no problems.

What I do is:
1) Cover the Alternator and Fuse Box with tin foil.
2) Spray engine with Simply Green and scrub with stiff brush
3) Rinse with Garden Hose being careful of electronics
4) Repeat 2) & 3)
4) Let air dry and start engine
5) Spray engine compartment with an Acrylic Sealant

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#4741360 - 04/28/18 11:01 AM Re: Engine Bay Cleaning [Re: WobblyElvis]
BHopkins Offline


Registered: 11/03/13
Posts: 1087
Loc: Utah
Originally Posted By: WobblyElvis
I was told by an auto detailer that cleaning an engine was something you should never do. He did it for a living but thought it lead to corrosion and other problems. It sure would be nice to have a clean engine but I just live with the dirt. I live in the rust belt, maybe it's a different story in other environments.


Is it true that excess dirt on an engine results in an engine retaining heat that it would normally dispel as radiant heat, thus resulting in an engine running hotter? And if this has any basis in fact, how dirty would an engine have to be to make any significant difference?

So if a guy drove a lot of miles on dirt roads, would it be worth the risk to clean off an engine on a regular basis?
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#4741369 - 04/28/18 11:21 AM Re: Engine Bay Cleaning [Re: BHopkins]
JamesBond Offline


Registered: 12/13/06
Posts: 843
Loc: midwest
Originally Posted By: BHopkins

Is it true that excess dirt on an engine results in an engine retaining heat that it would normally dispel as radiant heat, thus resulting in an engine running hotter? And if this has any basis in fact, how dirty would an engine have to be to make any significant difference?

So if a guy drove a lot of miles on dirt roads, would it be worth the risk to clean off an engine on a regular basis?


I would imagine that the cooling system does most of the cooling so a dirty engine wouldn't make much difference. Look at high end luxury cars that have the engine bay covered with plastic covers, a cover under the hood and a closed hood. As long as the radiator is clean the car should stay cool.

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#4741370 - 04/28/18 11:23 AM Re: Engine Bay Cleaning [Re: BHopkins]
WobblyElvis Offline


Registered: 09/23/14
Posts: 1303
Loc: Toronto Canada
Originally Posted By: BHopkins
Originally Posted By: WobblyElvis
I was told by an auto detailer that cleaning an engine was something you should never do. He did it for a living but thought it lead to corrosion and other problems. It sure would be nice to have a clean engine but I just live with the dirt. I live in the rust belt, maybe it's a different story in other environments.


Is it true that excess dirt on an engine results in an engine retaining heat that it would normally dispel as radiant heat, thus resulting in an engine running hotter? And if this has any basis in fact, how dirty would an engine have to be to make any significant difference?

So if a guy drove a lot of miles on dirt roads, would it be worth the risk to clean off an engine on a regular basis?


Good point, who knows...
I have read that of all the heat generated in an engine approximately 1/3 goes out the exhaust pipe, 1/3 leaves via the radiator and 1/3 is radiated by the drive train. That being said, I've driven through the mountains of Georgia at 99F fully loaded with a dirty engine and an old radiator without any problems. If the cooling system is good, I can't see a problem.

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#4741371 - 04/28/18 11:24 AM Re: Engine Bay Cleaning [Re: NewEnglander]
Reddy45 Offline


Registered: 08/15/08
Posts: 2888
Loc: USA
The main thing is to not use a jet spray nozzle. A "fan spray" is more than adequate to wet the engine down, and then you use some soapy solution with a SOFT brush to scrub away any grease, then rinse with the fan spray.

Once that is done, use an electric leaf blower or shop vac (on blow, not suck) to dry off the engine bay, paying attention to any spot where water can "pool" near electronics.

No need to dress the engine bay with anything unless you're prepping for a car show. Any chemical you leave on the surfaces will just attract dust quicker than if it were dry.

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#4741379 - 04/28/18 11:30 AM Re: Engine Bay Cleaning [Re: Reddy45]
SatinSilver Offline


Registered: 01/24/08
Posts: 9916
Loc: OH
I like this video from Chris Fix on the topic:

https://www.youtube.com/watch?v=PRSoRkM8GcM
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#4741380 - 04/28/18 11:31 AM Re: Engine Bay Cleaning [Re: NewEnglander]
WhyMe Offline


Registered: 12/18/12
Posts: 499
Loc: Washington for now
i have washed many cars engine bays with my pressure washer and a all purpose cleaner like purple power. spray it down with degresser. wait a few minutes and then blast it with my pw.

recently i have started foaming the engine with my foam gun. never had an issue with cleaning the bay

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#4741413 - 04/28/18 12:06 PM Re: Engine Bay Cleaning [Re: NewEnglander]
JustinH Offline


Registered: 04/17/04
Posts: 5144
Loc: Texas
too many electronics in modern engine bays to spray a pressure washer all over the place.

I use a can of wd40 (big blast), and some microfiber towels and it cleans everything up.
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#4741437 - 04/28/18 12:36 PM Re: Engine Bay Cleaning [Re: NewEnglander]
JTK Offline


Registered: 08/14/03
Posts: 10498
Loc: Buffalo, NY
I lightly hose my engines and engine bays down down with most vehicle washes. I'll slosh some of the soapy water from the car washing bucket on dirty spots, give what ever areas I can a wipe with a rag and rinse. I never do it on a hot engine and I don't concentrate water spray on the electrical components.

I've been doing this for over 30yrs and I've never had a problem associated with doing it that I found.

My engine bays look new. Hopefully subsequent owners appreciate it.
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#4741442 - 04/28/18 12:42 PM Re: Engine Bay Cleaning [Re: NewEnglander]
Pelican Offline


Registered: 11/28/12
Posts: 128
Loc: Ajax,Ontario, Canada
I've always heard that the best & only way to clean an engine bay is with steam, but very few places do it or have the equipment for it.


Edited by Pelican (04/28/18 12:43 PM)

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