Z key on keyboard not working
Recently cleaned my keyboard with a multi-surface cleaner and cloth (which I now realise was a bad idea). Initially the Z key would stick, but now the Z key doesn't work at all. To resolve this I have flipped the key off and cleaned thoroughly with 99.7% pure Isopropanol. I have also done the obvious disconnect/reconnect the keyboard, powered the Mac off and back on.
It's a Mac Bluetooth keyboard, and I know I could but a new one for £40-50 on eBay but I wondered if anyone had any other suggestions, or if anyone knows if Apple offer a keyboard repair service (my apple care product expired on 28th Feb and they want to charge me £25 just to ask that question).
Any help would be appreciated.
iMac, Mac OS X (10.7.3)