Swabbing helps dry the interior so that pads are not damaged, inhibits bacteria growth, and removes any build-up of foreign particles from foods, beverages or saliva in the instrument. [2] X Research source It is not unusual to see a slight green color on the pad after a few passes. This is normal and does not indicate rust or metal damage. [3] X Research source

You can run water through the neck as well — just be sure that no water comes in contact with the cork, or it may swell and deform. Soaking with vinegar or brushing with detergent can help get rid of excess build-up. [4] X Research source

Some manufacturers make similar items such as “bell brushes” or “neck savers” for other parts of the saxophone. These are fine to use similarly if you have them, but not necessary for regular saxophone maintenance.