Just had my son-in-law over to take my top Class A 3' Chimney down so I can clean the cap. It was build up 2/16 of glazed creosote only in the last 3' of chimney and cap. Tried to clean it, but it's on there good. I run my 8" brush down the pipe got most of it clean. The cap I had to scrap it out the best I could but there is still a small amount there. I did not get any pics. 1. What is the best way to clean it off? 2. Will it be okay until spring?