I look at all nutrients... to me eating clean isn't just about fat and protein and calories, but sugar , sodium, cholesterol, etc. Also what other important vitamins and nutrients you need.
I take care of whole body, not just the aesthetics. That's what clean eating is to me. I honestly think that's what real bodybuilding is, it's not just about looking good but really watching what you put in your body. You can eat a caloric deficit everyday, doesn't mean you are necessarily eating clean and are doing your body a true service.
and IIFYM really isn't much different (I think) from what people who eat clean do, anyway. Yea, you cheat... but it's once in a blue moon. IIFYM still doesn't suggest you eat a whole lot of fast/junk food. JUST that if you do, make you sure you don't go over your caloric intake. If you know you gonna go ham at a bbq give yourself the room in your calories to do so.....
Like I said, it's about the body in the long run. No one should allow justification for eating a lot of processed foods, period.