If the Baking Soda doesn’t work then you might want to soak it in Oxi Clean for 2-6 hours or more. I did this with some pots I bought at a yard sale. After soaking them I took an SOS pad and scrubbed the metal around the handles. All of the built up dirt/grease came off. Even the baked on dirt/grease on the bottom of the larger pot. I don’t think it will hurt but definely try the baking soda first. Actually I probably would have been able to get the built up grease/dirt off with a regular scrub pad after soaking. It might have taken a bit more effort (elbow grease). Let us know if either method works please. It would only be polite.