Most of the
devices I have seen have seals on them that are designed to
keep out cleaning fluids. The micro units almost are even shown in sale
A number of electromechanicla devices (swithces, piezo buzzers, relays,
etc) have tape seeals fitted at the factory. They can then be soldered ot
a pCB, the PCB washed in the normal flux-removign solvents, and then the
teals ripped off. But after the sals have been remvoed, the devices
should probavbly not be immersed in solvent.
-tony
Use a BEE. They will buzz even when wet.
What do you do if you require a weather resistant buzzer?
Ben.