[header] How to clean a beer keg [title] Depressurize the keg before cleaning. [step] A keg will have to be completely depressurized before it is disassembled, otherwise you risk damaging the keg and hurting yourself. Leave the tap open and let any remaining liquid and pressurized air escape before trying to remove the lid. 
[substeps] Once the hissing sound caused by escaping pressurized air has stopped, the keg will be completely depressurized. [title] Remove the keg's lid and the sealing o ring.