I spent the last two hours installing an EVOMS V-Flow intake system. Nice little project and sounds quite nice. Might even rev more freely over 4K rpm's but always very subjective.
But while I had my hands in there I found that the engine compartment was pretty dirty/sooty. I usually do a bit of cleaning with a rag whenever I add fluids or something, but this was just general ick. It was once an east coast car if that matters but regardless, can it be cleaned? The usual tape/plastic over the important parts (which ones?) and use a mild engine cleaner and water w/no pressure? I've never done it but a detailer did it on my wife's Lexus. I was pretty nervous but (he didn't even cover up any key parts) and it worked out fine.
And advice?
Thanks,
Verde

 

I've always washed my engines myself. I just use a regular hose and I wash the compartment with the same soap I use on the outside every 2-3 car washes.

Here are some Don'ts based on my experience:
-Do not use a pressure washer
-Do not use engine degreasers that they sell in stores as they will dry belts and hoses.
-Do not spray water into the air intake or filter etc
-Be aware of eletronic components such as batteries, fuse boxes, alternators etc, don't spray them direct, if you are worried, cover them with a bag... (not much of an issue in a 911)

Dry the compartment with a rag and let the water run down before starting the motor.

Here is a little trick to make the compartment look nice after you are done. After a wash, all hoses and plastics will look dry. Spray some WD-40 on a rag and clean the hoses and plastics such as the valve cover with it... Do not spray the stuff direct though as you might get it on belts... Looks as good as a pro job after this.

 

Place rag over air filter if you have a KN or EVO kit, spray engine down with simple green, let soak and use a dish brush on any grubby spots, then spray off well with hose. use a bit of interior spray dressing to brighten up plastic / rubber parts (but don't get any on drive belt). I keep my engine area looking pretty new this way, I typically wash it off once every two weeks.

 

Thanks all for the advice. I'll give a go later today.