Please choose the correct ending to complete the given sentence: Health: [header] How to clean a waterpik [title] Wipe down the unit regularly. [step] Unplug the unit. Wipe down the reservoir with a soft cloth and a cleaner that is mild and non-abrasive.

Ending1: The process will be very similar to cleaning an aquarium. If you find yourself unsure, consult the manufacturer's manual for further instruction. Ending2: Scrub all holes and cracks in the unit. [substeps] Avoid using table salt, which could contaminate the cleaning process and lead to secondary errors. Ending3: Then rinse the unit by running through full reservoir of pure warm water. Do this as often as weekly if you use your waterpik often. Ending4: Try an isopropyl alcohol or tsp. Isopropyl alcohol is most effective at treating waterpik stains.

Answer format: ending1/ending2/ending3/ending4