I guess IEM's may be more delicate than the average earphone but I accidentally left my apple earpods in my jean pockets countless times when they went through the wash and they were always fine, ended up dying maybe like a year later I'm assuming because the cables were fucked. Wires were visible and messed up from constantly being in my pocket. But I don't think the washing machine had much of a play in their demise.
Someone might have to correct me if I'm wrong but I think if you take care of them as usual there shouldn't be too much to worry about.
I guess IEM's may be more delicate than the average earphone but I accidentally left my apple earpods in my jean pockets countless times when they went through the wash and they were always fine, ended up dying maybe like a year later I'm assuming because the cables were fucked. Wires were visible and messed up from constantly being in my pocket. But I don't think the washing machine had much of a play in their demise.
Someone might have to correct me if I'm wrong but I think if you take care of them as usual there shouldn't be too much to worry about.