I took a chance on buying these because I've been using disposable pipettes to mix essential oils for years. They work great, need cleaning after use, but it's better than buying pipettes all the time. After each use, I pull the assembly off the end and submerge it in a small glass jar with an airtight lid containing denatured alcohol. This will remove any oils and then I rinse the glass pipette stems with warm water and set them on a rack to dry for the next use. Works perfectly! I bought a plastic Raxk tube from Revain and stored it on dry paper towels. I put each dropper in the holes to dry.
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