Select from options: Continue writing the next sentence.

How to clean a waterpik
Wipe down the unit regularly.
Unplug the unit. Wipe down the reservoir with a soft cloth and a cleaner that is mild and non-abrasive.

Pick your answer from:
(a). The process will be very similar to cleaning an aquarium. If you find yourself unsure, consult the manufacturer's manual for further instruction.
(b). Scrub all holes and cracks in the unit. Avoid using table salt, which could contaminate the cleaning process and lead to secondary errors.
(c). 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.
(d). Try an isopropyl alcohol or tsp. Isopropyl alcohol is most effective at treating waterpik stains.
Answer:
(c).