I have a St Croix Ashby pellet insert and a fire started in the hopper in the winter. I let it just flame out rather than put water on it. There's a sticky substance everywhere inside the hopper and the stove and it has a burnt smell. Today was 90 degrees and the stove is smelling so I want to clean it. This happened about 6 months ago. How can I remove the smell? I already shop vacced out the pellets when it happened. Since I had a hopper fire, due to probably low airflow, is my stove shot? I dont really want to use it anymore since NG is so cheap but I will keep it there for looks.