Are you talking the usual "chrome" the makers put all over the car model parts to make them appeal to the under 5 set?
Check out the links under cars and you'll find as many answers to the question as you can stand. I myself have switched from household bleach to Simple Green. You can try the others, but Simple Gren seems to remove even the bio hazard stuff they put on the AMT lits now.
Don
I know it's only rock and roll, but I like it.