Yours floated in from my wife's crap in the garage

 

a good number of girls use lotions on their arms, etc. that have some amount of glitter in them. this would easily get on that leather part on the inside of the door and could stay there for a long time. glitter is very difficult to remove. so if a girl's ever ridden in your S or sat in the drivers seat to pose or something, theres a good chance thats why you have a glittery interior.

 

this is way too weird.........same thing happened with mine too.......on the steering wheel