My healthy looking, curious, independent, and alpha chicken (barred rock) has always had a tendency to sneeze. We went on a two week vacation and left them in good hands for that period. When we returned, I noticed she was sneezing a bit more significantly. I've noticed she seems to have a little caked on dusty goo on part of the nostrils. I'm wondering if there is a specific treatment for sneezing or for gently cleaning the nostrils. I don't want to push any of it into the nostrils to cause it to get infected or anything. She is eating, drinking normally and is just Miss Personality...Smartest chicken of my four! Their run is a tad dusty but I keep it very clean. (I do use diatomaceous earth around the coop and run). I don't want to spend the $ for an expensive, unnecessary vet visit. But on the other hand, I don't want it to be a spreadable virus to the other three. Any suggestions would be appreciated.