I have had great luck with CorrosionX to get surface rust and pitting to a manageble level. CorrosionX responds to heat very well, actually speeds up the process. Here is what I do.

1. Take grips off and soak with CorrosionX
2. Soak inside of Ziploc bag and put gun inside
3. Place in a Borestore
4.On a hot day place in the back window of a car (Where applicable)

After about 4 or 5 hours (gun maybe too hot to handle with bare hands) I pull the gun out blast it off with more CorrosionX. After about the 4th time I will wipe it down with a microfiber rag. Once again this gets the rust to a manageble level. After that you can use some of the methods suggested above to fine tune things.

Chad Gripp