Refresh pale bumper on your old car with heat gun.
Step 1: Make It Look Like New
Very simple, and best way to make pale bumper on your old car look like new.
Do not use this metod on painted surface, beacuse you can damage paint.
All you need is heat gun. I find some old, but useful heat gun in my garage.
Turn on your heat gun and keep tip of blower 3-4 cm far from surface. Keep on one place until you see difference, and bumper get back to original color.
Take a piece of thick cardboard when you working near painted car surface, and hold it betwen painted surface and blower to protect paint.
I did this today to my car, and it looks preety good.
I hope this will be helpful.