When cooking ribs using the 3-2-1 method, saving the juice after the 2 hour mark

I usually drain off the grease before using it. Best way I've found is use a zip lock bag.
Pour the drippings in a zip lock bag. Cut a small hole about an inch away from one of the upper corners and hang up the bag for about 20 minutes. This will allow the grease to separate.
Now squeeze a lower corner between two fingers and cut 1/8 of an inch off the tip. You can now drain the drippings off and discard the grease.