Liquid is bad for the following reasons:
(1) Liquid weakens the adhesive between stylus and cantilever. (2) High-end cartridge with hollow cantilever will actually siphon the liquid into the inside of the cartridge from capillary action. (3) The evaporation eventually deposits a layer of grime on suspension elasto-meter and coil, eventually degrading the performance and accelerate the wear.
Further detail:
http://www.extremephono.com/Stylus_Cleaner.htm
(1) Liquid weakens the adhesive between stylus and cantilever. (2) High-end cartridge with hollow cantilever will actually siphon the liquid into the inside of the cartridge from capillary action. (3) The evaporation eventually deposits a layer of grime on suspension elasto-meter and coil, eventually degrading the performance and accelerate the wear.
Further detail:
http://www.extremephono.com/Stylus_Cleaner.htm