I don't have the rattle, and I'd know cause I'm one of those who can hear the whine.

Fixing minor issues yourself can be a good thing, but before everyone starts trying to solve the problem themselves they need to remember that locating the actual source of a rattle can be tricky. What seems to be a rattle in the dash might be originating somewhere else, like the wheels. That said, unless there is a service bulletin of some kind the dealer is likely to do exactly what twingo did -- start tearing the dash apart and stuffing.