Created to best care for your Braun Series 3, 5, or 7 Electric Shaver, use the Braun Clean and Renew cartridges to keep your Braun Clean and Charge shaver in tip top shape for a superior shave day after day. Each replaceable cartridge is filled with alcohol-based cleaning fluid to automatically lubricate and clean your razor. Once a month, replace the cleaning cartridge to remove shaved stubble and debris from the shaver head. Lubricates Blades During the cleaning cycle, the Clean and Renew System’s specialized cleaning formula automatically lubricates the blades for optimal cutting efficiency, adding a refreshing lemon scent in the process. Just one cartridge will supply a full month of cleaning. With the Clean and Renew System, you can extend your shaver’s longevity and improve its performance over time.