Hi Dan
I think there is some really good advice here on what you can accomplish without spending a large amount of your hard earned $.
I think I managed to get a pretty decent engine bay by doing the following:
1. Degrease the whole engine & surrounding areas including suspension/frame, transmission, peripherals etc - I used marine clean which is non-toxic and non-corrosive. Worked brilliantly.
2. Followed up with warm soapy water and various sponges, brushes and tooth brushes to clean every surface and item
3. I then attached a polishing pad to a cordless drill and buffed up all the manifolds, cylinder head cover, etc
4. Then used fine sandpaper to go over everything again.
5. Redid step 2
6. I then went about spraying the brake booster, coolant tank, radiator, air cleaner, etc in black heat proof paint.
7. Renewed various hoses & clamps, etc
8. Very happy with outcome
9. All up cost me about $200 in sundries. And many hours of time, scraped knuckles, broken finger nails etc
BUT I did not remove or detach anything !!!
It can be done.