I work with crafts nearly every day and more during the months of November and December working with fine glitter. That's when my sinuses start getting a little congested. When I am through with the work I walk into the bathroom wash my hands and then fill my hands with luke warm water and sniff the water into my sinus cavity and blow several times and Walla all clear. If I don't get to do it and an infection starts I use a few drops of peroxide and it's clear within 10 to 15 minutes. It took a couple of years to realize it was what I was working with that caused the problem. Yes, I wear a mask most of the time but that stuff just flies everywhere.