I've experienced this "vaper's tongue" a few times. Then I discovered it coincides with mild hayfever (I do suffer from) or other sinus problems. Worked in the yard for over 6 hrs yesterday and today my taste is off. Even the most mild sinus irritation can interfere with taste and smell. You can brush your teeth and rinse until its desert dry but if your sinuses are screwed up it won't help much. A mild "sinus relief" med works for me but check with your doctor before using anything.