I am trying to remove the paint off of my front bumper, and just leave it the matte black plastic color that it was originally before painting.

I have already tried with minimal success using paint strippers, and had wanted to know if I purchase a orbital sander, whether I would be able to sand the paint down to the plastic? If this is the case what grit(s) sandpaper would be recommended?

I do not intend to paint over the bumper again, maybe just use trim restorer.

Thanks!