Well, I like a mix of soy sauce and Italian dressing- but only for marinade.
For cleaning, plain old Hoppes' #9. If you are trying to deal with accumulated carbon and crud, low odor mineral spirits can also be used.
One of the best products I have ever used is KROIL. Made by Kano labs, it is (IMHO) the best penetrating oil made. Will get under carbon, lead or copper, and loosen it from base metal.
What we have here is... failure- to communicate.