stinky keyboard?

[Rosie Redfield]

Hi,

I've recently noticed that the keyboard of my iBook has begun to give 
off an unpleasant smell.  The computer is a 500MHz white iBook, about 
14 months old.  The smell began a month or so ago and has been 
getting worse - it's a rank sweaty smell, a bit worse when the iBoook 
is warm, and definitely coming from the keyboard itself, not the 
internal hardware.  I don't think it's dirt (the keyboard is 
spotless) but some sort of breakdown product produced by aging 
plastic.

Has anyone else noticed this?  There's a recent thread on Mac's iBook 
support discussions about it, but no consensus on the cause and no 
solution.

Rosie