Welp, Ortofon doesn’t recommend it either:
• The use of solvents on the stylus and cantilever may damage stylus cement. Also, interior parts of the cartridge can be affected seriously by the intrusion of solvents.
NB: Ortofon do not recommend the use of the Onzow Zerodust stylus cleaner.
Review quote from Analog Planet, Jul 25, 2012, by Michael Fremer: "...The Onzow Zerodust is recommended only if you can prevent your platter from moving when you lower the stylus into the mound of gel, and only occasionally, unless you exercise extreme caution each and every time..."
Periodical use should be fine though. The brush can only remove some of the crud, no matter how much I brush.