I just received my latest toy from George - the Buon Vino auto bottle gravity filler.Haven't used it yet, but just playing around with it I wondered how to thoroughly clean the thing after use. The diaphram part doesn't easily come apart (it's screwed together like you're not supposed to take it apart), so it looks like the only way is to flush it out but I can't see inside to make sure it's really clean. I know some of you have used it - how do you clean it?