Kenmore C Febreze Vacuum Bags, 3 Pack, 21R51 To maximize performance and extend the life of your vacuum, filters should be cleaned and replaced regularly. Clean filters after every few vacuum uses and replace every 6-8 months, or more often if you have a lot of pet hair or messes in your home Premium allergen filtration Routinely changing your vacuum bag prevents dust and debris from cycling back out of the vacuum and into your home! The foam filters are washable  clean by hand washing in warm water. A mild detergent may be used if desired. Allow the filter to air dry completely before replacing See the description below to see which vacuums fit with this filter!