Here's one way that works, it's kind of working backwards and then working forwards.
The problem you have is called Paint-Transfer. I put a hyphen in there so in the future I can find this by using the search term
Paint-Transfer
If I just type paint transfer and then search for paint transfer I'll pull up a kazillion threads with the word paint and transfer. Just a side note.
Goo Gone and Turpentine and all kinds of chemicals and solvents work sometimes but usually the problem you're trying to over come is that the paint off the other object is hyper-forced onto your cars paint under extreme pressure and sometimes wiping it with 'something' just doesn't work.
When that happens, here's another option.
You need to get something gritty. You're going to use the physical grittiness or grit particle to grind and abrade the offending paint off the good paint. You have to be careful and try to only work on the surface of the offending paint. This means focusing on the task at hand, this means paying attention as you move a piece of terry cloth with your fingers as you work the abrasive product to abrade off the offending paint.
A by-product of this process is you'll tend to leave scratches or hazing in the good paint. That's the price you have to pay to remove the offending paint-transfer.
The GOOD NEWS is you can usually easily remove these scratches by re-polishing with a less aggressive product.
I've done this procedure hundreds of times in my life and it works really well. I actually did this for someone at work recently as the same thing happened to a lower quarter panel. I knew I should have taken before, during and after pictures because it was really bad and it came out really good but alas I didn't.
Note you really want to do this by hand, not with a machine. You need to exert a lot of pressure to a small area and foam pads and wool pads are just too big for this and too dangerous for this, so use your fingers.
Next you want a piece of terry cloth for use as your application material. The nap of the terry cloth will give the abrasive product more bite and the nap will act as a gentle form of abrasive in an of itself.
Here are three products that are gritty that you can use to abrade off paint-transfer.
XMT Heavy Duty Swirl Remover #4 Polishing Compound
Meguiars Mirror Glaze #4 Heavy-Cut Cleaner
Meguiars Mirror Glaze #49 Oxidation Remover Heavy Duty Cleaner
The XMT uses a sharp, mechanical abrasive and works very fast. The two Meguiar's products use Macro-Diminishing Abrasives and won't work as fast but the abrading power is more gentle because the abrasives will crumble as you work them.
Just to note, I used to avoid products like the XMT #4 because of how aggressive the are but as long as you're careful with it and as long as you understand anytime you use it you're going to have to do a second step to remove it's abrading marks then it's a great tool to have i your arsenal of detailing products.
If you can find an OLD can of DuPont Rubbing Compound or Turtle Wax Rubbing Compound, the old stuff is very gritty and abrasive and will work also. When I say old, we're talking Pre-1980's back when a compound was a compound.
Hope this helps, if you have not had success yet and the paint-transfer is still on your car's paint then document the process with pictures.
