I used to put down a bed of foil on the bottom of the PBC because I don't like the buildup of grease sludge down there but lately I've taken to something a Gateway drum guy does:
1) I got some Floor Dry pellets from Auto Zone (used to soak up motor oil) that I line the bottom with that soaks up the grease and never burn.
2) After 2-3 cooks, I clean with a dedicated, long handled pooper scooper from Amazon.
So easy and not messy.
As others said, don't bother cleaning up the sides but I do worry about cresoate buildup on the bottom of the lid dripping on the food. I clean that like I do my Egg: crumpled ball of foil every 6 months or so.