For optimal use, experts recommend cleaning out a vacuum after each use, which includes emptying the bag or canister as well as wiping the machine down. Carver advises people with allergies or asthma to also wear a mask when doing housework, “especially when cleaning out your vacuum cleaner where particles may escape into the air.” The mask will add an extra layer of protection between the person and what’s being released as the vacuum is cleaned.  Additionally, “you can clean the inside of the vacuum canisters with a damp cloth, which can also help keep particles from floating into the air,” she says. Changing or cleaning filters is also key when owning a vacuum. “This is often the best thing you can do with a bagless vacuum as they can clog easily if not cleaned regularly and emptied regularly,” Dr. McGrath says.