Although most of the cleaning will be the glass, as the stone heats up quickly enough to vaporize and pass along the resin. There is although ways to ensure the Vapor Stone is in perfect working condition.
Before all else, you must remove the stone from a pipe or attachment by (gently but firmly) striking the stone face down on the palm of your hand, or any soft surface.
Holding the stone with long metal tongs, torch the stone with a large butane flame until glowing orange. This will loosen any resin that maybe stuck inside the stone. Only need to do 1-2 times, it doesn't require much.
The stone should cool down within a minute or 2. At which point you can replace it into your glass piece.