Just hope I guess.

In all seriousness if the rust isn' t removed like I mentioned above in Rustydale' s topic take some 0000 steelwool and very lightly go over it. Since it' s blued you need to be extremely careful to not over do it or your bluing will be ruined.If it' s surface rust this should do it for you. I use RIG when I wipe my guns down.The stuff works great and really protects.
Ruger Redhawk