This may be old news to some of you, but for me, it's new found glory. I always get these blotchy, rainbow colored spots on the bottom of my stainless steel cookware.  And, I never knew how to get rid of them.  Truth be told, I didn't even know that there was a polish for it.  But, even if I knew of the polish back the I don't know that I would've used it.  The word "polish" just sounds like a lot of work.  And, I really try to stay away from chemicals.  I don't even use chlorine anymore.  So, as I was saying.  I found another way, a greener way to clean my cookware. Just a splash of vinegar or lemon juice, and it's like magic. It's amazing! It works every time.  Makes my cookware look new again. And, I love the look of polished stainless steel.