What would the delay be if you were to use new clothes. I found out about my sensitivity when i decided to buy new cheap polyester clothing at moddells. I realized my clothing was what was giving me the issues. It became immediately aparent as i tried different ways to clean my used clothes.
I believe that i cannot control the outside factors so much. The permethrin works the most. I might feel a little 'ghost' itch but not as immediate as before. But then again some of this might have to do with me getting better. The key is eliminating it in my gut. I think these guys are signalling from within. And clothes with the slightest parasitic, bacterial or protozoa signature gets pulled in like a magnet. At least that's how it feels. I don't feel this way with new clothes.
If you find out what sticks to clothing after all the washing options please let me know.