I was wondering if pipettes can become "dirty"? When I blend my eos, I have jars that I store my pipettes in. Either an empty container (glass) of that same eo, or a larger mason jar. The mason jar serves as a catch all pipettes if I don't have an empty eo jar. But I just realized that I don't clean my pipettes because I just believe that they are just eo and there is nothing dirty about an eo. However, my lavender soap is the only one lately that has been giving me Dos, I did a tester and thought that a clay was doing it, but I still have Dos, just not as bad. Then I wondered about the pipettes, I went back to look at the mason jar pipettes in better lighting and saw that the tips of all the different types of eo pipettes in the mason jar, there sits a small amount of eo. I've noticed this before, only thing, when I looked at the pipettes all together, I didn't like the look, all together they looked like.....dirty. So I wonder if pipettes can do a cross contamination when I dip my pipette into a jar of eo?