I searched for about an hour on the forums looking for someone who has mentioned this.
A couple of weeks ago, I mentioned that I took my SS down my road while it was getting repaved and had some mud clods thrown all over it. The paint with it's clear coat cleaned right up. Nothing else has.
My seats are stained and no amount of scrubbing or hitting it with a power washer is taking it out. Also, the black trim on the hood seems to be stained and again, power washer isn't getting it all.
For the trim, I think a soft brush may work, but I don't want to marr any plastic by doing something rash.
I have no idea on the seats, I've tried 3 times now to scrub and power wash.