Seriously it could be the magnet in the cartridge attracts dust....this might be to simple of an explanation so feel free to consults the experts.
White debris on front of cartridge
Hi all. I’ve noticed when I play vinyl with my Clearaudio Maestro V2 MM, an accumulation of white dust forms on the front of the cartridge. Yet when I play my Hana SL MC cartridge, there’s no accumulation. What’s going on? Is it a tracking force issue? I set each cartridge well within the limits of its recommended tracking force.