Cartridge cleaning

There is a lot of information in the forums reagarding record cleaning and preperation but, little about the art of cartride cleaning. In the past I always used the discwasher stylus cleaning solution and brush. Now I have a Lyra Helikon cartridge and the paper dust cover has made me afraid to use a liquid.
What are the accepted cartridge cleaning rituals among all you more experienced than I? Is the Zerodust cleaner a good product?