MadMartigan23

Yes, all would work. But of those, my preference is actually one you didn't list, Interior Detailer. As a spray, you can use it over the entire engine bay after cleaning and (mostly) drying, and simply close the hood. It'll dry and self level, requiring only a quick level if any and leaves an incredible finish.

Works fine.  I've been using all of them on my engine parts for years, both plastic and stainless with no issues.  

It's a strong degreaser and a few ounces in your wash bucket will help strip wax, sealants, etc. But we also have Strip Wash that is designed to do the same and safely. Neither are touchless.

Yes, but be sure to first completely clean it, and then wipe the coating residue off soon after applying. Maybe 30 seconds or so, to avoid potential streaks.