I've been worrying about this too-especially with mail-order fabrics. I put my last order in my freezer for 2 weeks. Not sure if that even works but I read it somewhere. Is it obvious if the fabrics have them? For example can you just inspect them outside before bringing them indoors? Or are they invisible? (the eggs or whatever?) I don't like putting anything other than freshly washed stuff in my dryer. I don't want those chemicals from the fabrics bouncing all over the walls and end up on my clean clothes but I don't like to prewash everything right away either.