I just used my new immersion chiller yesterday for my 5gal brew. How the heck do you guys get all the water out that is in the 30 feet of copper when you are cleaning up? I don't want the copper on the inside to rust!
I just turn mine upside down and practically all the water comes out - once it starts coming out one of the tubes, it siphons all the rest right with it. Never had to resort to blowing into it or anything.
If I had an air compressor handy, I'd give it a few blasts afterward to dry it out a little more just for good measure, but it doesn't even seem necessary.
The output hoses from my chiller are a bit long and run a little downhill. If I disconnect the input hoses first, the output hoses siphon the chiller until almost empty. I follow with a blast from my air compressor.