Ames, I would have noticed a young sephardic couple 🙂
I just felt like they were doing something dangerous without halachic reason to. They had NOT asked their Rabbi about it. So, dunking an appliance is not very smart, unless your Rav says yes, do it. Even then I would be worried about plugging it in, but I would follow my Rav.
As a general rule, electricity and water do not mix well.
Mod72, we clean out our keyboard using those air canisters. Its amazing what gets blown out.