They're probably permanent, the stainless steel has been bored into by something. Do not use bleach on these surfaces unless you immediately wipe it off completely & rinse. It can cause pitting of the stainless steel. You could try rubbing w/ a fine grade steel wool back/forth in one direction, then a coarser steel wool if fine doesn't work. This, of course, is only if the stainless steel isn't polished smooth & shiny.
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