I agree with Jim on this one. I never took any pictures, but my grandmother's old Griswold was in much worse shape than that. I sprayed it down good with oven cleaner and shoved it in a plastic bag as Jim described. It came out great! Several hours of soaking in a vinegar and water solution as well as some work with an SOS pad took care of the rust. After seasoning with shortening in the oven it's as good as new.It should come out fine. Oven cleaner and shove it in a garbage bag over night should improve it tremendously.
What you are doing is like taking a nice nickle plated razor and stripping it down to brass to make it "cleaner"
You might want to sign up on one of the cast iron forums but DON'T tell them what you have done unless you want to be kicked off after your first post and talked about for weeks
That's the effect I am going for.
As for being kicked off a cast iron forum... I been thrown out of better places than that.
Use the liquid dishwasher detergent, it'll get you down to raw metal overnight. Just scrub it with a rag or nylon abrasive pad after soaking it. I like to strip my old cast iron finds back to unused condition, that way I know how it was seasoned. Probably unneccesary, but it makes me feel better about using them. Besides, it gives you an excuse to cook lots and lots of bacon!That's the effect I am going for.
As for being kicked off a cast iron forum... I been thrown out of better places than that.