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Does anyone out there have any experience with the various "soft" sandblasting media for removing mold residue from fired glass? I have used fine hard media at low pressure for this removal in the past but they are still pretty aggressive on the glass. I know that there are soft media like crushed walnut shells, crushed corn cob and plastic grit that are available but I thought that I should see what others thought.

Peter's had luck with soda blasters and at some point I'll try one. Right now, though, I've got a plain old power washer that's doing a wonderful job of removing all mold residue, so I haven't needed to change anything.