more info on these agricultural cleaners with dilution rates is available on the DEFRA website. FAM30 is one of the few that can be used to kill foot and mouth. V18 is cleared for most disinfecting purposes EXCEPT f&m. V18 is used to clean small animal cages and aviaries etc, so at a reasonable dilution shouldn't harm us, the lethal dose of iodine is in the range of 30mg per kg or 2.4g for an average adult. (however rats have survived 14000mg/kg doses) idophors also decomposes to a gas and leave no residue. ps good article on idophors in brewing on wikipedia. credits to Robert Arguello.