Hello all, I need to remove the front plastic bumper cover so that I can bolt a tow bar to the steel bumper bar hidden underneath. I found the four bolts that hold it on and tried to get them off with a socket wrench but they won't be budged. Are they welded? On my car they aren't rusty at all so I don't understand why I can't get them off.

Also another problem: I tried too hard to undo one of the nuts and the socket got stuck on there. How can I get it off? What is the proper socket size by the way?