When your intelligent screen alerts you, it's time to clean your Dyson V11™ vacuum filter. Cleaning it at least once a month is optimal to retain suction power. Follow these simple steps: 1. Remove the filter. 2. Tap it lightly to remove any dust and debris. 3. Wash it under cold water, gently squeezing the filter until it runs clear. 4. Fill filter with water and shake firmly to release trapped debris. Once emptied, shake again to remove all water. 5. Leave to dry in an area with plenty of airf