I forgot to add earlier, that now that you have it polished, you should spray that down with Brownell's Hold, or something similar, as if you don't, it will rust again in no time. You can keep applying Hold until you get ready to blue it. I would reapply it every 4-5 days, you just spray it on. Any good cleaner will remove it, before you start to blue.
Hold is only available now, by the gallon, and it runs around $35.00 or so. I fill a pint spray bottle with it, and spray the parts as soon as they're polished.