I first mentioned this in my post "what to do with moist pellets", but it seems to warrant it's own thread. I've switched to Somerset pellets, and the stove is running wonderfully. However, even with Somersets, I still get a thick band of opaque build-up on the top 4" of the glass after about 12 hours of running. It starts with a haze after as soon as 15 minutes, then slowly builds up to thick and black. This band has appeared with all 4 brands of pellets I've tried so far. Someone had mentioned that if this was happening with all brands of pellets, then there is a problem with my stove. I have no problem getting the glass clean. The shop vac with brush attachment takes 99% of it off. I use stove glass cleaner only when a wet paper towel can't get the last bit. The manual mentions that the glass needs to be cleaned every day. Could it be that this is just the way it is with this stove? If not, what can I try?