I am using the Apollo eGo with the Apollo Clearomizers. The instruction manual (yes, I read it!) said to "disopose of the clearomizer when done". How do I know when to dispose of the Clearomizer? Ssshhh don't tell anyone, but I have washed one out and just refilled it when it was dry (thank you YouTube....I think). Do I dispose of the Clearomizer when it starts leaking???? I have no idea what they mean by this. Thanks!