Thanks for the story, but I think this is the exception - not the rule. If I started doing all the things "I'm supposed to be doing" my poor system would get totally confused. Hey - some people need preservatives in their food, tannens in their booze, and chemicals in their fabric. DH has allergies - when the dust gets bad, he knows where the vacuum cleaner is. I figure you just need to outwait the dust bunnies. Eventually they get too big to be bothersome. (good grief - poor guy did not chose his wife well. lol)