Surprising Expiration Dates : RealSimple.com: "With help from experts and product manufacturers, Real Simple has compiled a guide to expiration dates. These dates are offered as a rough guideline. The shelf lives of most products depend upon how you treat them. Edibles, unless otherwise indicated, should be stored in a cool, dry place. (With any food, of course, use common sense.) Household cleaners also do best in a dry place with a stable temperature. After the dates shown, beauty and cleaning products are probably still safe but may be less effective."
This is very useful. Some of them like bleach is a lot shorter then I thought. It looks like vinegar does better on the long term storage front then bleach or most other cleaning supplies.
We are trying to save up some long term emergency supplies and this will help make some decisions for us.