Bumblefoot isn't caused by imperfectly cleaned coops. It's physical damage to the foot - like from walking, perching or jumping on surfaces that are too hard, too sharp, etc. The wound gets infected and that's when you get bumblefoot. If you have the conditions for foot damage to occur in the first place, it doesn't matter how much you disinfect your coop, because the chickens will still poop and step in their poop and get infected regardless. And if you don't have the kind of conditions likely to cause foot damage, then it won't matter that the coop isn't disinfected, because walking in poop is not a problem when the chicken has healthy feet.
Disinfecting a chicken coop is overkill and unnecessary, and won't last long - they'll go and poop all over it as soon as you're done. If everything is kept dry and well ventilated, and there's a good bedding-to-poop ratio, it's clean enough.
