Guy could be slamming back doubles at McDonald's each and every day and still look about the same.
The only time a bodybuilder need clean his diet substantially is pre-contest. Especially if he's using gear.
Training like a demon and eating an equal mix of clean and dirty calories is the way to go (as long as you inhale a lot of them, that is). Oh, and ordering that 500 dollar new supp at T-Mag, of course. Mix in some MuscleTech and you're gonna hit top-10 at the Olympia within a year, no sweat.