I like my waterpik and use it daily.
I find it good for jostling free everything from raspberry seeds to leafy things.
But look what I found today when I accidently jolted the waterpick compartment free from the water reservoir!!
I went back to the manual for the product and found absolutely nothing directing me to separate the two parts and clean regularly
Suggestion for the Waterpik people
Instead of this:
Wipe the exterior when necessary with a soft cloth and mild non abrasive cleanser. Reservoir may be washed with soapy water or in top rack of dishwasher.
Once a week separate the water reservoir from the water pik unit and wipe clean with soft cloth and mild non-abrasive cleaner.
This will prevent mold from developing.