Helps reduce dangerous creosote buildup. Helps prevent chimney fires. Treats existing creosote buildup and helps reduce new buildup making your next fire safer. Makes cleaning your flue easier. For Woodstoves, Inserts Fireplaces. Continues to treat creosote buildup AFTER the initial burn. Burns like a wax log. Helps prevent chimney fires. Makes cleaning your flue easier. For Woodstoves, Inserts Fireplaces. Burns like a wax log.