Wait, I was too hasty.  I realized when I got  back to my computer after trying 
the peroxide that I'd forgotten to try  silver cream.  When I got it and went 
to the sink, I found no  stain!  So, if you have a problem with staining, you 
might want to  try hydrogen peroxide plus a little patience.
  
                                                                                
      Pat 
  

                        
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