> So I ordered/received 2 piezo buzzers recently and they have a
> sticker covering the hole in the center that says "Remove seal
> after washing".
> What does this mean?  Am I supposed to give these things
> a bubble bath or put them in the laundry or something?

        When you build a circuit in an assembly line, is usual to solder and
after give it a bath of flux cleaner/remover. The sticker isolates
the internal cavity of the buzzer, so you have to remove it after
mounting/washing.

        Hope it helps

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