I assume this topic appeared a couple of time in the past, but here it is again ... what would be the best cleaning product to let sit in a dirty keg. I don't mind rubbing a bit, but I'm worried about the siphon tube cleanliness. Same thing for plastic beer line and faucet, is it the same product. Being in the subject, I'd also like to do a big cleaning of my plate chiller, my silicon tubing and my marsh pump ... how do you proceed with that?