Do not put any liquid on it, especially silicone sray. I had some finish come off mine with Armorall. The plastic in these cars aren't colored all the way through -- they are painted and the paint will rub off.

As far as the sqeak, you may have to drop the dash or you may be able to get at it from the side. If you end up having to separate the parts, felt work great.

If you had work done by someone there recently, take it back and have them do the work and make it right.

Good luck. Squeaks, rattles etc are so darn annoying.............