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Whats the best way to clean under the hood

10K views 11 replies 11 participants last post by  A3D  
#1 ·
I just dont want hose down my engine would a rag and a little soap and water do the trick. I am sure you guys are far removed and are using some other method of cleaning under the hood. Please advise???
 
#2 ·
Here is some info for you:
The first step in cleaning your engine is to remove the excess debris that gets trapped in your hood, grille and vent openings. This is particularly true if you live in an area with four seasons. If you have compressed air available, this is the best way to remove old leaves, dead cats and such. If you don't, a simple hand brush will suffice.

The next very important step is to prepare your engine for getting wet. You must cover all sensors, the distributor, spark plug openings and any electrical devices that have the potential for water accumulation (which could cause a short). Use plastic baggies to cover these items. Be sure to use tape or rubber bands to hold the plastic bags in place. You're only trying to prevent the majority of the water from getting in; it does not need to be watertight. The engine environment should already be waterproof. The baggies are just a precaution.

To loosen the grease accumulated on your engine and the engine compartment, start your engine and allow it to warm for a few minutes. The best temperature for cleaning your engine is warm to the touch, but not hot. If you're able to hold your hand to the engine without saying "Ouch," then the temperature is just about right.
After warming the engine and protecting sensitive areas, you're ready to apply your engine degreaser. Although they are quick and easy, I warn people against the use of harsh petroleum-based cleaners in the engine compartment. They quickly cut through grease and grime, but they also deteriorate your rubber and vinyl components (not to mention what they do to our environment!). As an alternative, use a citrus- or water-based cleaner
When applying your engine degreaser, it's best to start from the lower areas and work your way up. This prevents the degreaser from dripping on you as you clean the underside areas. One important thing to remember: the engine degreaser will remove the wax from the painted surfaces of your car. If you get degreaser overspray on your fenders, plan on rewaxing these areas.

When you have applied your engine degreaser, be sure to wash any excess cleaner from the exterior painted surfaces of the fenders, hood and grille. I like to spray these areas with water first.
Depending on the amount of accumulated grease, allow the degreaser to soak on the engine for 3 to 5 minutes. Do not allow the degreaser to dry on your engine. For light to mild levels of grease, you will not need to use a brush on the engine and other surfaces. For heavy soil, you can use a long-handled brush (parts brush) and car wash solution to provide additional cleaning action prior to hosing off the degreaser.
When you are ready to remove the degreaser, hose down the entire engine compartment and surrounding surfaces with plenty of water. If you're using a high-pressure nozzle, be careful that you don't get the nozzle too close to the covered electrical connectors. Allow your engine to air dry for several minutes before using a towel to wipe down all accessible parts. Remove the plastic bags. The heat from the engine will assist in the drying process; however, do not allow the engine to air dry, as this will result in water spots. When dry, start your engine and allow it to run for a few minutes.
When everything is dry, and your engine has cooled, you should apply a coating of engine protectant. If you don't have an engine protectant, use your rubber and vinyl protectant to coat your hoses, wires, and plastic shields. To add a quick shine and protection to the painted surfaces in the engine compartment, use a high-quality detailing spray. Just spray it on all surfaces, and wipe off the excess with a clean terry cloth towel.
(thx 90Brougham)
 
#5 ·
smithsa said:
I Washed my 95 Deville this morning with plain water from a pressure hose at a car wash and it would not start. I waited a short time and it finally started. Got close to home and it backfired and died. Do you think I damaged something? I would appreciate an answer from someone. Sandy
Sorry to hear of your misfortune. But, I always clean my engine(s) at the car wash. I have yet to have an issue.

Don
 
#6 ·
smithsa said:
I Washed my 95 Deville this morning with plain water from a pressure hose at a car wash and it would not start. I waited a short time and it finally started. Got close to home and it backfired and died. Do you think I damaged something? I would appreciate an answer from someone. Sandy
I've washed my engine with high pressure nozzle on my garden hose often and have not had problems.
You have likely gotten water or moisture in some of the electrical connections. WD40 will displace that water very nicely for you. Get a can and look for the most obvious connectors in the path of the cleaning spray. Carefully disconnect them, spray liberally with WD40 and re-connect. That should do it for you.
 
#9 ·
You could use a rag, water & soap, but it's too much time. I used to do that until I gave the water hose a try. I sprayed with the citrus based cleaner, let it sit for a minute, then hosed down. I tell ya, looks brand new and does a lot better job than when I tried to clean by hand.

I also second that recommendation on covering your electronic components. I forgot to cover the electronics when I hosed it for the first time and my car had a misfire. Removed the front spark plug wires and found all 4 spark plug wells are flooded with a few ml of water. After drained the water out using long Q-tips, the misfire is gone. All I cover is just the front 4 spark plug wells, the ignition coil, and the fuse box.
 
#10 ·
I spray Purple Power all over the enigne while at the car wash then use the pressue washer to wash it all down, if it hasn't been done before, then it may take a couple times.

Did it to my 425, 4.9 and 3800, no problems at all... I don't do that to the 425 anymore becuase I have a 14" open element air filter... but I have washed other engines down (friends 2 Jetta's..2.0 and 1.8T) and my cousins Stratus (2.7V6) and my father washes all his engines this way... best way possible.
 
#11 ·
I never actually used water. The only water I'd ever use is by spraying a little ont oa rag from a squirt bottle and wiping it down that way. Otherwise, before a car show I spray everything down with this orange clean / degreaser stuff and it takes care of EVERYTHING. I'd say to have a toothbrush or two to clean crevises too. I have the pushrod 4.5 with the little slots the the valve cover and those trap mad debris.