Good point. I just noticed that some (thankfully non-infected beer) beer had managed to back flow into my co2 tank while I was force carbonating through the bev out line. I'll likely just toss all of my tubing, put the co2 tank upside down, purge the beer out, and the next time the tank has been emptied stuff it in the oven with the valve open and heating it up to ~200F for a short while to kill any possible infection in there, and then clean out the regulator as best I can with starsan and what not.