I've tried liquid cleaners,the green sandpaper stuff given to me during a Linn clinic and the zerodust (I now live in Japan) but I still use my Audio Technica Stylus cleaner I bought nearly 20 years ago ! in case you don't know, its a battery operated device with a lit dense brush end on which the stylus is placed and gently vibrates. Its normally used dry but can be combined with a fluid if stylus is very dirty. Very effective and safe as only the normal cartridge downforce is used.
