Got distracted looking for pics for the bodypaint thread :)
Products used:
R222 Total auto wash (Non-toxic) & 303 Aerospace Protectant
http://www.polishedbliss.co.uk/acatalog/r222-total-auto-wash-cat2.html
http://www.polishedbliss.co.uk/acatalog/303-aerospace-protectant-cat19.html
Shop around can be got cheaper than links
R222 Total auto wash. 1. apply this liberally to your engine compartment, ensuring anything sensitive to liquid is covered obviously (cone air filters etc) - Leave for 5 mins after spraying (do not allow to dry) then agitate with a brush/sponge etc while removing with a light water spray. 2. Leave engine bay to dry, or dry manually with a soft cloth.
303 Aerospace Protectant 3. Apply this liberally to all surfaces within the engine bay, plastics, metals, the lot - Allow to dry - 1-4 hours. Ignore what the product labelling says about wiping on with a cloth and polishing off...just spray ensuring a good coverage and leave. 4. Cup of tea. 5. remove any overspray on non-engine bay paintwork, or windscreen with a soft cloth. 6. Another Cup of tea cos you're done. Start with a warm engine as it helps the 303 to dry quicker. Try not to get too much oversrpay on exterior paint, as it will remove most polish systems also. Won't harm the paint though.