8 Point garbage matte.
OK I did a tutorial on this before about a year ago and I it was pretty much a failure, I got a number of thumbs down on YouTube which I desired.
But I have a new method I would share with you using a Eight-Point Garbage Matte.
720 Eight-Point Garbage Matte Settings
1080 Eight-Point Garbage Matte Settings
Update on this one: Tony Hickey found a problem with the 1080 one that I posted so here is his version.