Reynolds makes a foil that is one notch heavier than Heavy Duty. It is called "Super Strength". That's what I use for lining the bottom. Grease is going to get under there no matter what, but the heavier foil lifts off easier. As far as cleaning the bottom, I don't obsess about it. I use an old plastic credit card to scrape off any loose gunk. Then wipe it out with paper towels. There is no need to get it perfect. Considering all the dripping fat and smoke that goes on inside these things, I consider them really easy to clean and maintain. I also thought I read somewhere on this forum that you should not put any sort of drip pan on a rack beneath your meat as it messes with the temperature reading, even cooking, smoke flow, or something...