We're pretty sure the earwigs are actually coming from the couch and not from outside. The couch sat in a driveway (covered) for a couple of weeks before we moved in here. We've lived here for about 5 months and never saw a sign of them until this week - and then just the dead ones that looked like they had come from the actual leg of the couch. We're thinking there might be eggs inside the frame/upholstery of the couch. We might try the detergent thing, but are there any other suggestions. We really would like to save the couch, but it really weirds me out to even sit on it now.