I gave this a try today and it works a treat, Ideal if you do not wish to treat the whole trim for minor polish stains, it worked very well on my trim.
Ever had polish stains on plastic e.g bumpers, grills etc.
Put on the back to black and it goes away - but comes back when thats worn off.
Try rubbing the polish stain (may also work on T -cut) with a PENCIL ERASER
Worked on my grill louvres - they had these polish stains when I got the car - now gone.