:whs: I have recently used UC and a terry cloth towel (for extra "bite") to get out some really tough scuff marks that a friend had on her black PT cruiser. It seems it was car vs plastic mailbox...boy did it put some scrapes in the paint...but the UC took care of it, no problem. Of course I had to rub, and rub, but I got all the scratches off. Now if the mailbox had been metal, well, we'd have a different outcome...
So I highly recommend UC for the fingernail scratches. It will take them right off!