Here's the response from Jason verbatim. I'd save this if you may have the need at some point in time to bring one of the Visionary particle balls back to OOB surface. Thnanks for the answer Jason and also Stephen.
To bring the purple ice back to box condition, they simply need to give it a good hot water and detergent bath, followed by sanding it with 320 grit sandpaper using plenty of water. This should break into a new layer of particle and remove some of the old track. Then simply use 600 grit sandpaper with a lot of water and he should have it back to box with that fuzzy feeling. Don't dry sand it, because it will clog the sandpaper and smooth out the particles. The same process can be done with the Midnight Scorcher, the Granite Gargoyle, and the Ogre Particle because they all use the same type of particle.
Jason
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Scott