No you don't have to, but I rinse mine with kmeta and roll them on a papertowel before inserting them.
I just like to sanitize them. Dont need to but I do, the little bit of moisture left makes them just a tad bit easier to insert.
Jim must be a Jim thing as I do the same, spray and insert......
Before I bottle I put them in a plastic container give them a few spritzes of meta put the top on give the container a few shakes and let it sit while I'm prepping the bottles then it's off to the races.
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