How to Remove Rust from Metal. When metal has rusted, throwing it away and buying a replacement isn't always an option. You can remove rust using household ingredients such as aluminum foil and a mild acid like white vinegar, or with.
I wonder if this would work on the sink drain. - Clean rust off stainless steel! Make paste with cream of tartar and lemon juice. Scrub lightly with old toothbrush until gone. Just took seconds to clean a spot on my sink!
How to clean rust with vinegar - 101CleaningTips.net