Bar Keepers Friend Liquid®, previously known as Shiny Sinks Plus, is the only liquid cleanser with lime removers. Bar Keepers Friend Liquid can clean even the most stubborn rust and mineral stains down to the shine without scratching.

I bought a bunch of used Cornies and some of them have what looks to be rust on them (strange since they are supposed to be stainless). When I would remove the posts, the threaded inlets would be stained & look rusted.

I picked up some Liquid Bar Keepers Friend at the local grocery store. This stuff rocks for removing these stains. I just shaked the bottle and covered the stain with this liquid and let sit for a couple hours. Most wiped away and the rest took just a little bit of elbow grease. This stuff gets 5 stars in my book.