This month's challenge is to purchase bleach, disinfectant and vinegar.
For hard core cleaning. Here are some ideas, found on the Reader's Digest website: http://www.rd.com/home/12-smart-ways-to-use-bleach/
I have heard that it definitely comes in handy in extremely humid weather, or to assist in cleaning up after a flood. It kills lots of nasties.
There are a few different types of disinfectant, so store the type that you would use. There are the cream types for First Aid for topical use, or there are the bottles of disinfectant concentrate you would use e.g. to clean your toilet with, or your kitchen benches. So depending on your need, is what you would store.
This one is an interesting one. It also can be used as a cleaner. I listed some uses, and some links in a previous post: http://denleydiaries.blogspot.com/2011/09/week-37-of-2011-food-storage-challenge.html