Remove white wax residue from rear bumper plastic bumper things
 

Sorry I'm not sure what the two bumps by the rear plate are called. I foolishly got compound residue on them. I've tried, so far, without success:

• Wd40
  Goof off
  Dawn

What the heck

Always had good luck with Mother’s Back To Black.

Or just prep them and do them to match the car.
It looks great when the bumperettes are colour matched.
Lots of threads on doing this floating around.

Pink Pearl pencil eraser.

As Steve says, those are bumperettes.

Thanks gents. Now have gotten really interested in the bumperette removal all together!

+1 for the Mother's Back to Black.

You can remove them, it only takes a 6mm Allen key, but you expose the bracket they affix to, and the hole in the bumper cover underneath.
Look in my garage photos, there’s a pic there of my painted bumperettes.
It takes various grades of sandpaper, high fill primer, base coat and catalyzed clear coat and a couple of days to get it all done.
Bumper Plugs sells complete painted ones, but I’m too German to spend that kind of bread.

That looks great. For the novice painter, do you have a guide of sorts?

I did something similar with wax. I used some full strength Simple Green and a tooth brush, took it right off...

I don't have any on hand. Surprised my full strength goof off didn't work though

I started with 400 grit to sand off all the pebble finish, then went to 800 grit then 1000.
Then I laid on a coat of high build primer and sanded with 1500 grit. Did it again.
I sprayed light coats of base coat until the can was empty, then did the same with the catalyzed clear.

I had Bumper Plugs do mine and they exchanged a set they had for mine plus my credit card, of course. They were a perfect match and held up perfectly for the 5 years I owned the car. Never read a bad forum comment about them.

If you decide to stick with black bumperettes...

I used Back to Black for a while, and liked it reasonably well. Problem was, it didn't last very long. I switched to Forever Black---lasts MUCH longer.