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Old 02-23-2014, 11:38 PM   #1
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Cleaning engine: necessary or not?

If yes, what should I use without breaking seals or screwing anything up?
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Old 02-24-2014, 12:14 AM   #2
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I've always done it on a warm engine bay, spritzed with water quick and then sprayed liberally with simple green avoiding the alternator, let sit for up to 10 minutes and then hosed it down. Don't go breaking out the power washer and don't get too crazy with the spraying water but everything in there is OK with getting wet. Lets see what others say but this will likely be hotly debated both ways.

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Old 02-24-2014, 12:16 AM   #3
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Yea I figured to put the hose on 'mist' that's just obvious. But I'm very skeptical about the cleaning products you can buy. Yea may do the job of cleaning, but is it safe to use?
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Old 02-24-2014, 12:52 AM   #4
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To answer your question, yes it is necessary. Keep in mind that mud holds moisture. Whenever I clean my engine bay I do it when the engine is cold, and I use a mist setting on the hose. As stated, avoid the alternator.
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Old 02-24-2014, 01:23 AM   #5
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Avoid the battery and the intake not sure how the JK's are but my TJ's is pointing straight up. Simply Green is fine. Light spray brush the hard stuff off. I use a leaf lower to get the bulk of the water off, then wipe down with a rag. If you feel up to it use a cleaner wax on the painted parts (will make the next time you clean easier).
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Old 02-24-2014, 03:47 AM   #6
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Simple green and a hose!
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Old 02-24-2014, 07:56 AM   #7
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Thank you so much!! And can you buy simple green at advanced auto parts? Also I have a 2009 jk. This is a 2012 jk engine, the 09's look exactly the same with just some stuff switched around
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Old 02-24-2014, 08:02 AM   #8
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Never mind about advanced auto parts! I found it at my Home Depot
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Old 02-24-2014, 08:02 AM   #9
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Ok, I did this in college as a prep guy for a foreign used car lot (think Jag, Merc, BMW, Porsche)...

Start with a cold engine

Spray the snot out of it with


or



start engine, let run for a couple min, and then spray off with hose. (not pressure washer). Let run till dry.

spray down hoses and rubber with


It'll look like it just left the detailers...

and you will be able to spot oil leaks quickly.
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Old 02-24-2014, 08:03 AM   #10
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Never needed anything but water to clean the engine, I just give my cars a quick spray of the engine bay when done washing the exterior. All of my vehicles engine bays looked like brand new when I traded them back in, there is no need to use harsh cleaners, or any at all.
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Old 02-24-2014, 08:10 AM   #11
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Never needed anything but water to clean the engine, I just give my cars a quick spray of the engine bay when done washing the exterior. All of my vehicles engine bays looked like brand new when I traded them back in, there is no need to use harsh cleaners, or any at all.
^ this is the difference between owning something from new, and trying to deal with others negligence (used jeep with careless maint. folks spilling oil down side of motor or from filter, with cleaning up after themselves..., or getting dried / baked on red clay mud off the engine...
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Old 02-24-2014, 08:11 AM   #12
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Yea may do the job of cleaning, but is it safe to use?
Is what safe to use?
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Old 02-24-2014, 08:13 AM   #13
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Never needed anything but water to clean the engine,
It's not even the fact that I want my engine to look detailed. It's just so it doesn't look like trash
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Old 02-24-2014, 08:14 AM   #14
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^ this is the difference between owning something from new, and trying to deal with others negligence (used jeep with careless maint. folks spilling oil down side of motor or from filter, with cleaning up after themselves..., or getting dried / baked on red clay mud off the engine...
Well I will give you that, but do the harsh chemicals once, don't make a habit of it. A quick spray of the engine bay with nice clean water only when washing the car, and your engine bay will look like new.
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Old 02-24-2014, 08:16 AM   #15
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Currently laying in bed I'll post a picture of my engine bay before I leave my house so you can see how dirty it is
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Old 02-24-2014, 08:19 AM   #16
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Well I will give you that, but do the harsh chemicals once, don't make a habit of it.
I thought simple green wasn't harsh? If I am going to use stuff, it'll be that. Seems to be the smartest stuff to use
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Old 02-24-2014, 08:25 AM   #17
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I thought simple green wasn't harsh? If I am going to use stuff, it'll be that. Seems to be the smartest stuff to use
What I was getting at, is that you shouldn't need to do this more than once, just use water after you go mudding and it should clean easily, let things sit too long and well. Anything more than water is just levels of harsh, but to each their own.
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Old 02-24-2014, 08:31 AM   #18
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Yea I planned on cleaning my engine once, and to start getting in that routine of cleaning it after I go mudding. But obviously after my engine is completely cold
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Old 02-24-2014, 08:32 AM   #19
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When I said getting in a routine, I meant with only water
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Old 02-24-2014, 08:41 AM   #20
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You should be good to go then, just make sure to rinse the engine completely of simple green. If I remember right it can do nasty things to aluminum parts, like white ugly stains, also likes to fade black plastics.
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Old 02-24-2014, 09:18 AM   #21
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Well I will give you that, but do the harsh chemicals once, don't make a habit of it. A quick spray of the engine bay with nice clean water only when washing the car, and your engine bay will look like new.
Depending on the motor and previous owner sloppiness, I have had to do some engines a couple to three times to get 'em real good and clean. Then after that, should only be a rinse down, or spot cleaning for leaks and what not.
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Old 02-24-2014, 09:43 AM   #22
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It needs to be cleaned asap
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Old 02-24-2014, 09:44 AM   #23
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The previous owner never cleaned it
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Old 02-24-2014, 11:20 AM   #24
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It needs to be cleaned asap

My OCD just went off the charts...LOL
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Old 02-24-2014, 11:40 AM   #25
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My OCD just went off the charts...LOL
Same here
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Old 02-24-2014, 04:15 PM   #26
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Lmfao 😂😂
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Old 02-24-2014, 04:16 PM   #27
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Welll I guises you can't post emojis on here
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Old 02-24-2014, 09:31 PM   #28
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Auto parts stores sell engine bay cleaner. Cover any electrical components that shouldn't get wet and spray the heck out of the engine with one can of that stuff. If there is any heavy crud you may have to go at it a bit with a nylon brush or something. Follow the directions on the can but they usually say to wait 15-20 minutes and then rinse it off with a GENTLE spray from a garden hose.

I do mine that way every 2-3 years. After rinsing I blow off any standing water with a leaf blower and let it dry. They also sell a detail spray for engines. Squirt some of that around the engine bay after it has dried and it will look like new.
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Old 02-24-2014, 10:15 PM   #29
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Old 02-25-2014, 12:13 AM   #30
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Thanks guys!

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