I decided to just go for it, totally stripped it down, all the keys in a bowl of hot soapy water to soak while I dismantled the keyboard, washed the whole lot in the sink, left to dry on the side for an hour then I went over it with a can of compressed air then a hairdryer.
It feels like a new keyboard now, the keys feel much nicer to type on and everything's shiny again :D
I was quite shocked by all the crap that was in it tbh, mainly tobacco and hair, from making cigs.
http://i1107.photobucket.com/albums/...g?t=1326634624