Wash it in lukewarm water and let it air dry completely before using it again. If desired, a mild detergent can be used. To ensure that your vacuum cleaner is working properly and optimally, we recommend that you replace the filter every 4 to 6 months. High-quality vacuum cleaner filters have a high-efficiency 2-in-1 design to block fine particles, floating dust, etc. The filter is made of high-efficiency filter material which can effectively filter dust, etc. to prevent large dust particles from entering the motor to ensure a long life for Dyson vacuum cleaners. Filters should be replaced every 4-6 months. If you have pets, please shorten the time change to improve dust collection efficiency. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.