The reason chrome alloyed steels don't rust is the chromium, in contact with air, puts on a very thin "oxide" layer that protects it from moisture. Anything (bleach) that will keep this oxide layer off long enough for rust to start works. Especially if you alternate it with salt water. Stainless steel rifles used in Alaska can still rust, especially when left out near coastal areas (salt water). Chrome plated steel (not that common with irons) will probably not rust because it is pure chromium and not alloyed with steel (iron). And could be quite deep so removing it would not be a good idea.
