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Before Pesach (Passover), they washed the pots. They would heat an iron to smoking hot and put it into the pot. The heat from the iron was supposed to burn out the Khometz (any residue of leavened material, such as leavened dough, strictly forbidden on Passover). And, there was special treatment for the silverware: if they used Khometzdickeh silverware (silverware used all year round and therefore in contact with leavened material), they had to keep it in water for six days. If you wanted to make any eating or cooking utensil Pesadiche (usable during Passover), you had to bury it in the ground for five days.
