If they are dull buy a can of armor all tire foam (see link). I sprayed the bumpers down, completely covered them in foam and let it sit like 10 mins. Then wipe off the excess. I am pretty sure this stuff moisturized the rubber, which is most likely dried out over the years, and now all i have to do is use a little armor all origional to shine them up.
https://www.armorall.com/prodcat/pages/tires_2.18.html
Worked great for me, but if you try it and your bumpers fall off don't come hunt me down.
Thanks,
Robert
https://www.armorall.com/prodcat/pages/tires_2.18.html
Worked great for me, but if you try it and your bumpers fall off don't come hunt me down.
Thanks,
Robert