Answer: The first question had to do with removing rust from an old gun. If your goal is to remove the natural aging of a gun where it gradually goes from the original bluing to kind of a brown patina--don't do it! You will destroy most of the collector value of the gun. If however the gun has patches of rust in some areas, and it is starting to look rather rough, then by all means stop the rust, but do it properly.
Do NOT attack it with steel wool or sandpaper. Remove the wood parts, then soak the steel down with Hoppe's No. 9 (I use an old toothbrush). Let it set about 20 minutes. Soak it down again, then brush with a brass brush (not steel or stainless steel). For really tough rust, you may need to repeat. This will not get rid of pitting--that will be a permanent part of the gun now. Wipe the gun down with clean rags. If you have compressed air, that helps too.
Now, you need to protect the steel to prevent new rust from forming. Use only oil that specifically says it is for guns (Rem Oil or Break Free CLP). Stay away from general household oils (like 3-in-1). Again, use clean rags to wipe off the excess. Both Rem Oil and Break Free have rust inhibitors and will not turn into "goo".
Also, if you ask a question on this sight, make sure you check your email (including your Spam folder) after sending in your question. It may take a few days before I get around to posting your question here (if at all). But if you include an email address, I will answer within a few hours during the week.