I use a matchbook striker to clean mine. I have used this on all my cartridges for over 20 years. Works great and is cheap. Just stroke the stylus once or twice on each contact surface, on the 45 degree angle, like the record groove is passing under it. That's it.
If this bothers you, then there are a number of things, like Record Research liquid, or Zerodust solid that are recommended by cartridge makers.
If this bothers you, then there are a number of things, like Record Research liquid, or Zerodust solid that are recommended by cartridge makers.