Who does not know it: Burnt tobacco sticks to the bottom of the Heat Management Device (HMD) and is difficult to remove. With this HMD brush you can get your smokebox clean again without much effort. It is best to soak your smokebox in lukewarm water for 30 to 60 minutes. Then scrub the underside of the HMD with the steel brush until the burnt tobacco is removed. The more thoroughly you do this, the better the result will be.