Not Kosher for Passover
Not kosher. Silver polish itself is not a food item, so it doesn't have a kosher status in the traditional sense. However, the concern during Passover is whether the product contains any chametz (leavened products) or kitniyot (legumes, which some communities avoid). Since silver polish is a chemical product and not for consumption, it does not fall under these categories. However, if you are asking about using silver polish on utensils or dishes during Passover, as long as the polish is thoroughly removed and the items are properly cleaned and kashered (if necessary), there should be no issue.