Thank You! I thought I was doing something wrong which was causing grease to get under my foil on the bottom of the smoker (which I am sure to punch a hole in for air/drippings). I thought maybe it spattered onto the walls and ran down the sides and under the foil, but wasn't sure. Cleans up easily enough with hot water and a sponge, but it is nice to know that I'm not alone in having this happen.