I plan on building something like this very soonish with a dual motor jdm bottle. So far I have the bottle, usdm sti nozzles, i/c spray button from a gc8 (which I plan to put in place of my cruise button since I don't have cruise anymore), and a bunch of autozone 18 gauge wire. All I really need now is some rubber piping and to drill some holes in my gc8 splitter.
CaptainAwesome - it doesn't get hot enough for any steam. If you're curious, just go for a drive til it gets hot, then take a water bottle and pour some on the i/c. Rather, it just seems to drop right through the core and the fins don't seem to stay wet for long, doesn't seem all that effective honestly, but I'ma do it anyway.
My only question is, if the windshield squirters and the i/c sprayers share the same bottle/liquid, would it be safe to spray windshield washer fluid on the i/c repeatedly? It won't rust anything eventually will it?