I use Nolvasan S. It is a scented disinfectant that does not rust metal. You can get it unscented, but I like the scented, it has a really clean smell.
Texas Animal Health uses it to disinfect their boots, tires, and equipment that they use.
We have been using it for over 7 years now with no problems. I spray the coops with it when I clean them too.
Jean