I have just aquired today 4 ropps two are in good condition 2 have a crack at base of the bowl Looking at these cracks they dont seem deep into the bowl And as they were estate pipes i cannot complain as the price was cheap.So i have a few questions all the pipes are cherrywood and the type of pipes that show the bark on them and the tree segs.I dont know how to clean this pipe what to use and im not sure how to repair the hairline cracks.Because they are ropps i think you understand why im asking advice can anyone help also can these hairline cracks be repaired