You're also not supposed to use vice grips on bolts, but it works.
If i remember correctly, and i may not. The IAC valve is all metal. The seat and all. So carb cleaner shouldnt hurt it. I don't know what ford is talking about, but if you believe it will screw it up, then ford doesnt make 85 bucks on a 25 dollar item.
Plus, its already not working right, clean the hell out of it.