Add just a teaspoon or 2 of Purex Crystals to the empty canister of a bagless vacuum cleaner. It will freshen the room while you vacuum. After emptying the canister, be sure to add the crystals before putting it away. This will assure yourself to a pleasant smell the next time you plan to vacuum. When storing with the crystals in the canister, it also keeps the washable filters (such as in a Dyson) always smelling fresh between rinsing.