Silver cleaning tip needed. [View all]

I've cleaned more silver through the years than I care to remember. Once in a while I will find a piece that has a deep, dark spot that will not polish out. I know about using Tarn-X with a Q-tip, but I don't have any now. Usually use Haggerty's or Goddard's polish, then use Wenol for a final shine. Need to get my project done and have no Tarn-X on hand. Any other way to "dot" these few spots, rinse and then polish as usual? Any help would be appreciated.
I am working on coin silver spoons, most have shined up well, 3 are spotted, not pitted.