I'm sure others experience the problem when they want to remove all traces of a strong ejuice flavor from their tank, and refill it with a different flavor. What is the safest and most effective way to clean a small ejuice tank? Somehow I bet rubbing alcohol is not a good idea as it cannot be removed easily from some tanks. I thought about using vodka, but rather drink it and not waste it on my tank cleaning activities ;-) Any ideas?