I think I read about Xlear on the Q thread months ago, and my dental hygienist also recommended it.
I don’t use it consistently but do after I’ve been to a busy grocery store or somewhere with a lot of traffic and lousy ventilation (think DMV).
I’m saving the super-dooper bottle of Xlear Rescue with Oregano, Eucalyptus, Tree Tree and Parsley oils. I figure that will really wake everything up when I use that.