CARE AND MAINTENANCE For cartridge filters, foam filters, and accessories. Proper maintenance of your wet/dry vacuum, including the washable filter and accessories, is essential to ensure efficient performance and a longer lifespan. Follow these guidelines to keep your vacuum in good condition. Filter Maintenance: 1.Regular Cleaning: After each use, remove the filter and gently tap it against a hard surface to dislodge loose debris. This will help maintain optimal airflow. 2.