Here's some information on how we detailed this B7 RS4 engine bay:
First start with the engine warm, not hot and not cool, this will help break up the contamination. Cover any exposed electrical items or intakes, etc. We either use a bag around an intake or aluminum foil to mold around exposed electrical items.
Next rinse down the loose contamination with a steady stream of water (we just use normal hose pressure).
We use
Poorboy's Bio-APC as our engine degreaser which can be diluted down to about 3:1 or stronger as needed. Basically while the engine bay is still wet from your rinse, liberally spray on the engine degreaser all over the engine bay. We suggest starting by spraying the bottom of the engine bay first and working your way up closer to the top of the engine bay to ensure you clean as much as possible.
Aggitate stubborn areas with a towel or detailing brush.
After a few minutes of letting the degreaser pentrate, rinse off the entire engine bay again. If you need more cleaning power, repeat the above steps at a stronger dilution ratio of the Bio-APC. Remove bags or aluminum foil at this point.
When satisfied, we suggest using a water based engine dressing such as
303 Aerospace Protectant. This will give you a bold matte look that will not attract dust and contamination like other silicone based dressings. It is also safe to use on plastic, rubber, vinyl, which makes it a great choice for an interior dressing that also provides UV protection from fading.
Complete the detail by cleaning and polishing exposed paint in the engine bay and under the hood.
If you have any other questions, please do not hesitate to ask. Here are some other write-ups on
engine bay care.
George @ Detailed Image
RS4 B7 engine bay clean
