I went to clean the stove this week and there is a black sticky substance on the inside of my stove. I have been using the stove but always on low and I think is just creosote build up I am going to turn the stove on HIGH and try to get rid of it but is there anything I can use to clean the inside of the stove with thanks. I used a wire brush but it just clogs the bristles of the brush in seconds. anyone else have this problem also. the hoper is clean with some fines but nothing stuck to the walls its just in the stove thanks again