2-in-1 mattress deodoriser & dust mite killer For years, Swiss clinics have used this professional mattress cleaner to keep their patients’ beds ultra-hygienic. Simply spray it on to kill dust mites & dust mite eggs & remove unpleasant odours. Completely safe for humans & animals, it is perfect for sufferers of allergies & asthma. You cannot boil-wash a mattress, but this tested & recommended spray is the next best thing. Use once a month, or weekly if used for an allergy sufferer.