I've been burning WalMart Trebios, just to try 'em, and they leave a lot of creosote - hardened carbonized crust- on the lip of the feed tube. I scrape with a screwdriver, and use a hammer/screwdriver to chip this stuff off. I'm getting frequent squeeking from this buildup from the auger. It's a PITA. Has anyone used a small dremel with hardened steel bit for this job? Scraping is hard, so is chipping, because of the awkward position of the tube lip inside the burn pot. Any useful suggestions?