Danda dhauti is a yogic purification technique designed to remove excess bile from the stomach and excess mucus. Traditionally, danda dhauti was performed by threading a lotus or banana stem down the throat. While that method is still used, the modern way of practicing danda dhauti is to use a catheter.
After the yogi drinks warm saltwater, the catheter is guided through the esophagus into the stomach and then removed. Danda dhauti should only be practiced with the help of an expert.