Vacuum cleaners may start to smell, because the dirt may stay in the bag or the container for a long time during normal use. During vacuuming, the air flows past the sucked up dirt and therefore the musty, acrid smell comes out via the vacuum cleaner’s air exhaust. Pet hairs in particular are a source of this smell, even when you empty the dust container or change the bag regularly. HG vacuum cleaner air freshener works as a vacuum cleaner perfume and deals with musty smells!