Cleaning Black Plastic Bumpers

A community member from England writes:

Got unsightly black plastic bumpers or plack plastic trim that is fading? Try using smooth peanut butter; it's cheap, easy to apply and lasts loads longer than Back to Black.

Stacey responds:

H-m-m-m-m, can't say I"ve tried this one, but I bet the natural peanut oil does the trick. My only question is how do you keep the neighborhood dogs from licking your bumpers all the time!?!?"