How have you gone with it Luna Moth? Any progress in identification and erradication? I can only imagine the frustration.

For what it is worth, I always put a few mL's of tea tree oil in with the rinse (I pour some white vinegar in the fabric softener dispenser, then the oil) when I wash bed linen and towels. Every now and then some eucalyptus oil in the rinse too, because I am pretty sure that most bugs don't like either! Or spiders for that matter, so I don't get any spiders in my linen storage. It has worked so far (knock on wood).