i dunno man id best try to find some tobacco pipe forums and ask them because wood is different you cant just use alcohol on it and shit because wood soaks it in......the most easy way i can think of is get a gun cleaning brush with nylon or even soft brass/steel brushes on it depending on the size of the hole where the smoke goes but one for a bbgun might work try that may help ive had to use a gun cleaning brush on my bowl a few times and worked good