Click here to download the maintenance guidelines for full product information. Cleaning: Never immerse the unit in water. Before cleaning, unplug from the electrical outlet. Clean the product when necessary by using a soft cloth and mild non-abrasive cleanser to wipe the exterior. The water reservoir is removable for easy cleaning and is top rack dishwasher safe. It is recommended that the reservoir is removed and cleaned weekly. Try and leave the unit dry and clear of water when not in use, taking particular care to avoid leaving any water around the charging point. Ensure that the reservoir cap is left open when not in use. Battery Care: It is recommended that the unit is charged overnight once a week. If left for any period without use then ensure that the unit is given a full 24 hour charge before storage. Ensure the unit is dry and the reservoir cap is left open. Warranty: The Waterpik Water Flosser Cordless Plus comes with a 2 year manufacturer?s warranty. If you have any issues with your unit, then please contact Waterpik Customer Services on 0844 335 6354 (charges may apply) or by e-mail ukcustomerservices@waterpik.com.