Given the general overpreparedness of people on this list (as indicated by the every day carry thread), I'm surprised about the gas mask comments. Wouldn't a run of the mill Home Depot filter mask and some sort of sealed eye protection be really useful for hazards not associated with a direct chemical attack on your person?

Regarding bleach, I always have a big stockpile. After reading Hot Zone, it became my number one cleaning agent - stops Ebola and that's good enough for me. Just don't use it on dog urine or you will need a gas mask (learned that the hard way).