what product will remove this stain on my bumper ?
 

I found this stain while cleaning my car yesterday. I've tried using wax,grease & tree sap remover spray cans and rubbing hard plus I tried using a plastic spoon to scrap it off. the thickness on the stain is about 1/10 of a mm, you can feel it but can't see the thickness.

On the bottom left a little above the grill you can see a horizontal line dent. If I was going to use a pen touch up paint, is sanding going to be required ? The dent is about 1/4 of a mm max.

Have you tried to clay it?

A quality clay bar and detailer spray should be able to get that off. Not sure about the dent tho.

Try Goo Gone...

Try clay or cleaner wax.

Last resort will be meguiars ultimate compound.

Very hard with out seeing it in person.
I use several steps: (in this order)(I try the least avasive first)

1-try a bug/tar or Goo Gone remove (shake the bottle, apply and let it stay on the stain for a few minutes)
2-try a paint restorer/cleaner wax
3-try a polishing compound (if you have a buffing wheel, SLOW speed and keep it moving around don't just keep it spinning in the same spot)(the orbital unit is not the best, they will leave scratches)
4-try a rubbing compound (SLOW speed, same process as the polishing, keep it moving around)
5-If you have to use the rubbing compound, go back with the polishing compound to remove any scratches you may have added.
6-Apply a Glaze
7-Apply carnauba wax
8-high speed whole bonnet

3m wax and grease remover. Most auto stores have it.

Laquor thinner will take that right off.

Try cleaner wax as mentioned, not sure if it's an indent or a raised bump.

+1 for clay bar and/or cleaner wax. If that doesn't work try a less aggressive polishing compound, if that doesn't work use a rubbing compound. Move from less to more aggressive.

Sulphuric Acid

It's a raised bump and its about 1/4 of a mm or even less.

this because it is minimal touching/rubbing.

Try this. R3 Racing Rubber Remover

http://www.mothers.com/02_products/0...tml#&slider1=9