When I'm mixing I usually take a coffee cup, fill it with water and nuke it for 90 seconds. That makes the water really hot but not boiling.
When I'm done using one ingredient, I just put the tip of the syringe into the water and fill-flush it a few times, then put it onto a paper towel. Because the water is so hot the syringe air dries very quickly and is ready to be used for the next ingredient by the time I get the bottle opened.
CAUTION: I had some very hot water once, fresh from the microwave and used it to clean my syringe that was just used used to deposit my 100mg nic
juice. SWOOSH!!! The nicotine was forced from a liquid to gaseous state almost instantly! It was pretty cool but not something I'd purposely do again! Nicotine has a very low flash point, so be careful.
Good luck.
Pete