When smelling lots of things that are somewhat similar (wines, coffees, etc.) I have found you can get some sort of smell fatigue and stop being able to easily

When smelling lots of things that are somewhat similar (wines, coffees, etc.) I have found you can get some sort of smell fatigue and stop being able to easily differentiate smells. One trick I have been taught is to smell something that's very different to reset your senses. I've seen people use their clothes, the back of their hand, etc.