Cleaning the stem and stummel after the pipe cools with everclear with a pipe cleaner is what i do after I take the spoon from my czech tool and with the back of the spoon i kind of burnish the inside but not to hard. This helps to keep the cake just right. If you are smoking a meershaum tale you tool and lightly scrap the inside then take a paper towel and twist it in. Put your pinky inside the bowl and feel for anything lumpy . If you find some particles still stuck to the inside go again with the pipe tool and the paper towel.