My tea kettle had turned disgusting. It is a stainless steel kettle with a copper bottom. Over the years it had become tarnished, rusted, and since it has been a permanent fixture on the stovetop (I love me some tea) it had become crusted with grease splatters. I clean it, of course, but I never worked at getting it shiny.
I mixed up my typical scrub, which is baking soda and dish soap. It helped, but not enough. So I added table salt to the scrub and then got to work scrubbing. It worked!!
Adding the salt gives it much more abrasive qualities. Be careful using this on something which may scratch, but otherwise it is a great booster to this cleanser. It also works great for tea and coffee stains inside cups!