So like most, I avoid cleaning the inside of my AQ if at all possible, however, grease can get under the foil on the bottom and occasionally I do clean it. Especially after a 14 hour shoulder cook. Simple Green will not cut through the grease, nor will it remove creosote. Greased lighting, however, cuts directly through both. The one thing I will caution you is to be absolutely certain you do not have any residual aluminum foil on the bottom. Greased lighting reacts with aluminum and causes the aluminum to stick to the stainless steel. I usually spray greased lighting on the bottom of the AQ, let it sit for a couple of minutes, then simply hose it out. I avoid getting it on the sides or door area and just wipe that area off with a paper towel. I limit my use to the bottom of the smoker.