Are we talking glass or plastic pipettes? If glass, you might be able to remove the top and soak in rubbing alcohol. I just avoid the whole cleaning part and use plastic. After using one, I label a ziploc baggie with the EO/FO name and drop the pipette in there for next time. I admit it's kinda a pain to rummage thru my box of baggies searching for something specific but I can't bring myself to toss them after a single use.