"Smelly keyboard" = old iBook keyboard plastics must degrade over time (UV exposure?), and I've come across a couple now that give off this horrible odour - kind of like someone hasn't used deodorant

Click to expand...

I've come across those myself. Really bad and nothing you can do to get rid of the odor. I read (I think it was on a LEM article) that it is the adhesive that gives off this smell. And your description is exactly how it smells.