The frequency of cleaning and replacement depends on usage, but generally: 1) Coffee makers and kettles should be wiped down and descaled (if applicable) between each guest stay. 2) A deep cleaning should be performed monthly, including running a vinegar solution through the machines. 3) Kettles typically need replacement every 1-2 years, while coffee makers may last 3-5 years with proper maintenance. 4) Hotels should have a regular inspection schedule to check for wear, damage, or malfunction, replacing equipment as needed to ensure guest satisfaction and safety.