Pipe cleaning is very important. When your pipe has been smoked over a long period of time it gets a lining within the bowl. This cake, over time, may become too thick, reducing the bowls capacity. This cake should ideally not exceed a sixteenth of an inch, or 1.5mm. So when it goes beyond this it should be carefully cleaned.

NICE Smoking Pipe Stick Cleaning Tool Tamper Pick 2in1 DY03
NICE Smoking Pipe Stick Cleaning Tool Tamper Pick 2in1 DY03
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NICE Black Smoking Pipe Stick Cleaning Tool Tamper Pick 2in1 DY21
NICE Black Smoking Pipe Stick Cleaning Tool Tamper Pick 2in1 DY21
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Vintage KLEEN REEM Pipe Cleaning Reaming Kit Hard Case BEST Pipe Tool Ever
Vintage KLEEN REEM Pipe Cleaning Reaming Kit Hard Case BEST Pipe Tool Ever
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Vintage Tobacco Wood Pipe Cleaning Tool ATMOS PIPE NAIL NY 3 NY
Vintage Tobacco Wood Pipe Cleaning Tool ATMOS PIPE NAIL NY 3 NY
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Portable Cleaning Tool Reamer Tamper for all kinds Tobacco Smoking Pipe Pipes
Portable Cleaning Tool Reamer Tamper for all kinds Tobacco Smoking Pipe Pipes
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CAO CARAMELO JOE empty clean CIGAR BOX Flavours series Petit Coronas ExCond
CAO CARAMELO JOE empty clean CIGAR BOX Flavours series Petit Coronas ExCond
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Stainless Steel Smoking Pipe Cleaner Ash Cleaning Tool
Stainless Steel Smoking Pipe Cleaner Ash Cleaning Tool
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New Smoking Pipe Stainless Steel Red Wood Cleaning Tool Reamers Tamper 3in1 D03
New Smoking Pipe Stainless Steel Red Wood Cleaning Tool Reamers Tamper 3in1 D03
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Reusable Cleaning Type Cigarette Holder Filter Clear Off White 2 Pcs
Reusable Cleaning Type Cigarette Holder Filter Clear Off White 2 Pcs
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Vintage Pipe Cleaning Tool Tobacco Tamper Czechoslovakian made
Vintage Pipe Cleaning Tool Tobacco Tamper Czechoslovakian made
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Cleaning Type Reusable Cigarette Filter Holder Blk Blue
Cleaning Type Reusable Cigarette Filter Holder Blk Blue
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Nice Smoking Pipe Stainless Steel Cleaning Tool 3in1 Tamper DH06
Nice Smoking Pipe Stainless Steel Cleaning Tool 3in1 Tamper DH06
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Vintage Bulldog Pipe along with Ream n Clean bristles and two Pipe tools
Vintage Bulldog Pipe along with Ream n Clean bristles and two Pipe tools
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GORGEOUS Made in LONDON ENGLAND Canadian Estate Pipe MINT  CLEAN  z10
GORGEOUS Made in LONDON ENGLAND Canadian Estate Pipe MINT CLEAN z10
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Vintage Old German White Clay Pipe Churchwarden UNSMOKED Estate Find Clean
Vintage Old German White Clay Pipe Churchwarden UNSMOKED Estate Find Clean
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To this end, a number of pipe tools have blunt-pointed blades. The reason for a blunt point is to prevent gouging the bottom of the bowl. This obviously works, but it's fairly easy to cut the cake unevenly, or even worse, to dig into bare wood. There are a number of adjustable, multi-bladed reamers available, you will find that these will do a much nicer job. Another way of carrying out this task is using a series of wooden dowels with varying diameters, wrapped with a fine grit sandpaper.

Whichever way you choose, when pipe cleaning remember to work slowly and carefully so that you don't damage your pipe. You are ideally looking to gradually shave the bowl cake to the proper thickness, not trying to scrape it out in great chunks. If you are unwilling to do this task yourself you could always take your pipe to a tobacconist. They will usually clean your pipe for a nominal fee.