Reddit mentions of Gunk FEB1 Foamy Engine Brite Engine Cleaner - 17oz.

Thank you! I followed this guide as closely as possible: https://www.autogeekonline.net/forum/how-articles/50352-how-detail-your-engine-like-professional.html

Basically first used saran wrap around and electrical, lightly hosed off everything, sprayed with cleaner (i used Gunk Foamy Engine degreaser which was 5 bucks at auto zone), let sit for 10-15 minutes, used brush to scrub everything, sprayed off again with water, let it dry, then sprayed with Gunk Engine Shine

I dunno. Maybe engine cleaner will work. It’s a long shot, though.

Do not go to a dealer for detailing work, ever. Dealer detailing departments are some of the worst things out there. I'm speaking both as someone who has 2 friends working at a BMW dealer, and someone who had a Ford dealer's detailing dept put scratches in the rear bumper of a brand new 2016 Mustang GT that won't come out.

I like using this stuff, you're going to need a few stiff bristle brushes as well

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https://www.amazon.com/Sonax-543200-755-Engine-Cold-Cleaner/dp/B00OA1QJZU

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if you need to go hard core

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https://www.amazon.com/Gunk-FEB1-Foamy-Engine-Cleaner/dp/B000ABGA6W/ref=pd_lpo_sbs_263_img_1?_encoding=UTF8&psc=1&refRID=V91WZBBEDC95KC20P14J

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join up on /r/autodetailing as well

Foamy to degrease
https://www.amazon.com/Gunk-FEB1-Foamy-Engine-Cleaner/dp/B000ABGA6W/

Shine to finish
https://www.amazon.com/Gunk-CEB1-Ounce-Automotive-Accessories/dp/B0002KL6JM/

I've used this on before with good results

I know this smell. I went through the same thing when i brought my 2017 Mazda 3 home. I opened the hood and check everything.

I can see liquid in the small gaps around the air filter cover. I used cotton swabs to soak up the liquid and check to see what it is.. The dealer used those "engine cleaner" cans under the hood.

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I guess is they tried to make it look new for cars that have been sitting for a while.

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https://www.amazon.com/Gunk-FEB1-Foamy-Engine-Cleaner/dp/B000ABGA6W

You're a tad over which fine. Looks clean too, you're set.

Your engine bay is dirty. Not gooda for the engine to handle its heat. Also not good for the seals and rubber tubing. Disconnect the battery and go at it with this:

https://www.amazon.com/Gunk-FEB1-Foamy-Engine-Cleaner/dp/B000ABGA6W/ref=mp_s_a_1_2?ie=UTF8&qid=1538632190&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=engine+bay+cleaner

A messy bay can eventually warp the hood from the heat. And damage the engine.

It's dangerous to go alone, take this.