2dog, (as this is my first encounter with you, I welcome you to the forum!), you are right about the bleach on the shelves, however the potentcy is mostly reduced by UV and heat. So if the bleach is not in clear (opaque) bottles it should be at about 'full' strength when you buy it (I'm assuming that the store doesn't crank the heat to 90 in the winter). If it's in the clear bottles ask if you can buy a case from their storeroom. In any event, if there's dust on the bottle- you might want to spend a few more cents at another store -Waste