Each pipe consists of 2 major parts -- the grey mouthpiece and the main body of the pipe. The main body is assembled from a plastic transparent tube and a brown plastic removable unit. The plastic transparent tube has a white tiny part inside -- this is the tar catching stick. When cleaning the pipe, first separate the mouthpiece from the transparent tube, then remove the tar stick from the transparent tube holding it with a paper tissue. You can clean the stick and the inner part of the tube by wiping off the attached tar with a paper tissue or a cotton bud.
In case too much gunk accumulates in the pipe, we advise washing it well by soaking it for a while in lukewarm water with some added dishwashing liquid or some other neutral detergent. Please be sure to dry the pipes thoroughly before using them again.