Zud Heavy Duty Cleanser Powder: 16 OZ WORKS WHERE ORDINARY CLEANSERS FAIL! For Use All Around the House! Removes Rust Stains. In the Kitchen ZUD Heavy Duty Cleanser removes stains from porcelain sinks and stainless steel sinks. ZUD cleans countertops, ceramic cookware, and pots and pans. In the Bathrooms ZUD Heavy Duty Cleanser cleans and dissolves embedded rust and hard water stains in the toilet bowl. ZUD removes blue copper stains, mineral deposits and other discolorations in the bathtub, a Features Made in United States USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.