Using a float switch exposed to mothballs

[GpsFrontier]

Hello Anachro,
I don't see a problem, something that small cant leach enough pesticide into the water to be an issue. After a few days/weeks the smell will dissipate. But if you want just rinse it off, soak it in soapy water and give it a quick scrub. If it still gives off a smell put it in a container and cover it with baking soda for a day or two as well.