Whink Rust Stain Remover-1261, 6 Ounces: Can use it in white sinks and toilets, and it is safe for all pipes and septic systems. With the powerful and convenient liquid formula, no scrubbing is required. It has been the number one brand for removing stains since 1947. This Whink stain remover is carpet and colorfast fabrics safe and comes in a 6 oz easy-to-store, shelf-stable bottle.