Tips from the Lifehacker community for cleaning stainless steel. For me, this one stood out:
"I clean stainless steel vault doors and safe deposit boxes as part of my job, we use the liquid BarKeepers Friend on the rust, but after using than then neutralize it with fantastik, wipe it down and then hit it with an oil spray. BKF has an acid in it that will keep eating away at your steel. And the powder is an unmanageable mess, always use the liquid."