#1 - you've gotta remove organic material - if there's manure, etc. caked up on surfaces, the 'organic' material in it will quickly tie up and neutralize virtually any 'disinfectant', bleach included. So, first-off, you HAVE to scrape/pressure-wash away all caked manure, crud, etc. I've seen calf barns where Salmonella was actually living(not growing, but surviving) in the wood structure of the crates/pen dividers. No amount of bleach was effective in cleaning up that mess - necessitated ripping it all out and installing metal pen dividers.
#2 - any non-porous surface, such as unsealed wood, dirt floors, etc., are gonna be difficult, if not virtually impossible, to effectively disinfect.
As others have indicated, bleach is corrosive to metals, and really not very effective at 'disinfecting' wood - yes, it may kill surface organisms, but
The quaternary ammonium and phenolic disinfectants, if used properly, probably will do a better job than bleach solutions.
One I'm most familiar with is 'One Stroke Environ'
http://www.pro-ag.com/default.asp?page= ... r=products