dust mites are some times an issue or basement mold can be partly to blame. I moved to a lake house that had been closed for almost a year; the basement was my downfall for a while . I had to wash all walls and cabinets three times before I had relief. I have fabric that lived there too and at times when I dig into my stash that was in that house I get a annoying runny nose. Guess I still need to prewash it all again.