Wash with warm water and allow to air dry completely before reusing. Mild detergent can be used if desired. Premium vacuum cleaner filters adopt a two-in-one design, filter dust, filter exhaust air, and protect the vacuum cleaner motor. The filter is made of high-efficiency filter material, which can effectively filter dust, etc., to prevent large dust particles from entering the motor, ensuring a long service life for the Dyson vacuum cleaner. Filters should be replaced every 4 to 6 months. If you have pets, please shorten the changing time to improve dust collection efficiency. Package Contents: 2 x Filters