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In page Tobacco pipe:

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When tobacco is burned, oils from adjoining not yet ignited particles vaporize and condense into the existing cake on the walls of the bowl and shank. Over time, these oils can oxidize and turn rancid, causing the pipe to give a sour or bitter smoke. A purported countermeasure involves filling the bowl with kosher salt and carefully wetting it with strong spirits.[citation needed] It is important to not use iodized salt, as the iodine and other additives may impart an unpleasant flavor. Regularly wiping out the bowl with spirits such as vodka or rum is helpful in preventing souring. Commercial pipe-sweetening products are also available.[citation needed]