Expanding on How to reattach handles on 30 year old pots?, I have a specific example. This pot has a screw-on handle that has rusted over time. I guess this is common since it is easy to get water in it that doesn't dry easily.
At this point the handle cannot be removed with a screwdriver. It occurred to me to try WD-40 but not being food safe I am not confident enough to try it.
So I would like to know if someone has had some experience in this kind of situation. I particularly like this pot because it is heavy gauge, non-stick and has 1 cup marks on the inside.