I have a St. Croix Hastings Pellet Stove. Last year I used some pellets that had too high of an ash count, and the stove got all clogged up. The glass would get dark black after 1 day of use. At the end of the season, I had the stove cleaned. It was vacuumed inside. I also snaked out the exhaust pipe, which is a tall vertical run that goes about 2 stories. I also made sure that I got better pellets for this year. Unfortunately, I'm having the same problem this year. The glass goes black after one day. When I try to burn the stove at the higher settings, the burning pellets overflow. I've read the posts on this site where people use a leaf blower to clean out the stove. Not sure that will work for me, as my stove is up against a wall with a long vertical pipe for an exhaust. Any suggestions?