Sanitise is a term used to describe the process of making something CLEAN and free from germs. DISINFECT, which has nine letters, is a process that involves using chemicals to kill germs. PURIFY, which has six letters, is a process that removes impurities from something. CLEAN, which has five letters, is a process that removes dirt and other unwanted substances from an object. All three processes are part of sanitising, which is the overall process of making something safe and hygienic.