I've been to a few cook-offs and comps to see how it's done and to get ideas for a big smoker build that I have in mind and I know those big rigs have to get pretty grubby inside with all the grease and juices dripping. How do those things get cleaned? I know some have drains and that will get rid of some of it, but what about what still sits in the bottom and the baked on goo on the racks? If you have one, please tell me how you clean yours out. I want to include whatever methods are easiest when I build mine.