My definition is of clean is a well organized camp, without trash everywhere. For one, I should preface that their are some major differences between base/spike camp hunting, and backpack hunting.
When I am backpack hunting, my trash from candy wrappers,bars,snacks, etc, goes inside a used mountain house packet. I fill it up, and if need be, then I go to another used mountain house packet. The empty packets/trash go into the bottom of my food bag. Burning garbage is sometimes an option depending on the circumstances. The extent of my "cooking" while backpack hunting, is boiling water. I routinely keep my mountain house's, snacks, and lunch food in a food bag, which stays in either the tent with me, or in the vestibule. When the weather is bad, I often cook (boil water) inside my tent/vestibule. Many times I've been tent bound for multiple days at a time when waiting out a storm, this is another instance when I cook in my tent.
As far as human waste goes, I dig catholes for you know what, and burn the toilet paper. This is always done away from camp, as one shouldn't **** where they eat.
Now, when I have a spike camp where weight isn't a factor, for instance during brown bear hunts, things operate a little differently. We bring in a cooler of real food (bacon, steaks, eggs, chicken, sausage, etc, etc), along with some veggies, canned foods, and other assorted food items. We generally have one tent for cooking, and one for sleeping. These tents will often be in close proximity to each other, depending on the lay of the land where we are camping. I keep one trash bag for garbage, and when that is full, I tie it off and start another one. If circumstances dictate, sometimes the garbage gets burned, sometimes it gets flown out. After cooking a meal, dishes are usually done after eating said meal, hence keeping things clean.
I find that there is a lot of bearanoia out there, especially when it comes to what to do with food in bear country. I've never felt the need to hang anything in a tree, cook 100 yards away from camp, or any of that other stuff. I've been camping and hunting in Alaska for quite a long time, and have never had a bear get into my camp (knock on wood), other than walking by.
Just my thoughts....
This ^^^^^
I strongly recommend an electric bear fence if you can manage one...but only for base or extended spike camps. I'm not so concerned about a night attack, but during the day I am not there to protect my tent from a curious bear of any color. That said, after hundreds of days and nights afield in central Alaska, I've not had a bear mess with my camp once...fence or no fence.
And this ^^^^^