These may not be used during Pesach, except as indicated. Only dishes and utensils specially reserved for Passover should be used, with the following exceptions. Silverware, knives, forks and spoons made wholly of metal can be kashered by a thorough scouring and immersing in boiling water. Any utensil which is to be kashered should not be used for a period of 24 hours between the cleansing and the actual kashering by immersion. Metal baking utensils cannot be kashered.
Authorities disagree as to the method for kashering drinking utensils.
One opinion requires soaking in water for three days, changing the water every 24 hours. The other opinion requires only thorough scrubbing before Pesach, or putting them through a dishwasher. Utensils used for baking during the year cannot be used during Passover. Chinaware, enamelware, earthenware, porcelain and plastic cannot be kashered. Pyrex used for baking cannot be kashered.