I just wanted to take a second and mention my affection for water soluble fluxes they make my life easier! If you've ever used a spin coat machine (spinner) to apply a polymer or flux on a wafer, you know it makes quite a mess. The whole theory behind spin coating is to fling excess liquid off the wafer (and consequently onto the inside of the machine). Being able to simply use a water bottle and a wet paper towel to clean the machine is a lot more desirable to me than using a solvent like alcohol. Who wants to smell IPA?