kimberley: If you lack isopropanol, many folk have used vodka, some swear by gin.
Hard to beat that fresh, mountain air like crispness that a touch of juniper brings to your stylus!
Seriously, any strong clean alcohol without sugar should do. Coloured beverages improve the sound the most when applied on..err.. in the listener...
The cheapest supply of clean enough industrial grade isopropanol is probably a bottle of carburator anti-freeze from the service station.
-mika