Is one of your AC units blowing towards your Fireview? Wonder if your creating the sweating glass syndrome were the stones are staying warmer then the air your cooling, thus sweating in a sense? Warm air on the chimney side , cold air on the outside of the stone.. Maybe open your draft to allow air to circulate?
Actually it is, but it's about 14' away...... I was able to clean it with a damp cloth, I can still see some of it right at the very edge of the cast iron frame but the only way I'm going to get that is to pull the stones off and clean them. Doesn't bother me that bad, the stove isn't even a year old yet but I'm sure after a few years I'll be cooking right on the stone!