I use my 3ml 14gauge blunt tip syringe to measure the VG, PG, and nic (nic last); I don't care if I get a little PG/VG in my nic either, it won't
throw it off enough to matter for me. I then use one of my 1ml syringes with the plunger taken out to drip my flavors into and plunge them out. I figure it doesn't matter if I'm mixing the flavors in the same syringe since I'm mixing them together anyway! If my flavor bottle doesn't have a drop tip then I use a separate glass dropper for each flavor. I only rinse them with water, but I also do it as soon as I have all of my ingredients in and the tops on (can't forget that part!

).