I've noticed that my synthetic wig never smells "clean" the way that my natural hair smelled after I shampooed. I'm using an unscented wig shampoo specifically for synthetic wigs. If I wear it for more than one day without washing in between, I feel like it smells dirty (even if I hadn't gotten sweaty- gone to the gym, etc). Does anyone else have this problem? What did you do to fix it? Thanks!