After reading the article I looked at my cantilever using a high powered magnifying glass , I saw what looked like dust on it but it wouldn't brush off .
It came off using a sponge tipped q-tip and 99% alcohol with a lot of careful rubbing. I stopped using the ZeroDust and started using BlueTack .
There was a discussion about damaging one's cantilever , in my case coming close many times but it did get me thinking and I came to the same conclusion that @larryi came to . I started to worry about the suction pulling down on the glued on stylist of my SoundSmith Carmen cartridge . I have stopped using the BlueTack and now only use a Discwasher Carbon brush and the SoundSmith brush that came with the cartridge .