Since I am a new pipe smoker,I am not an expert about taking care of my briar pipes.Someone told me to build up a good carbon cake inside the pipe bowl,I should leave the ashes inside the bowl as it is after each smoking.Is it true?I am confused!! If I leave the ashes uncleaned inside the bowl,whenever I put fresh tobacco for smoking, doesn't it mix up with ashes and tastes bad? Actually I clean my pipes thoroughly with a pipe cleaner after each smoke.I don’t keep any ashes inside the bowl.So please can anyone tell me how to build up a good carbon cake and how long does it take?