I am trying to remove built-up grease on the exterior and interior of my copper stockpot. All this morning, I have been scrubbing away with various cleaners -- Ka-Boom (which cuts through grease), salt and Comet Cleanser. I have been making some progress, albeit slow, in removing this grease. I am wondering if anyone here might have any suggestions to help me restore my pot. Incidentally, the back story is an idiot of a former friend used this pot as a deep fryer...hence the greasy buildup.