I bet that purchasing a new one for $25 from www.needledoctor.com will solve all your cleaning and rust problems.
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In March, I tried to buy a new stylus tip for my Grado MCX, that had the upgraded MCZ tip. Needle Doctor and 3 other companies indicated that the MCX-MCZ cartridge and stylus tips are discontinued and no new stylus tips are availible. I bought a new Clearaudio Virtuoso Wood cartridge. It is worlds above the Grado in all areas.