*RESISTANCE IS FUTILE*
I have used them as you would baking soda in a fridge
. Really helps to get rid of fish smells. Go buy "Joe's Joe" at the corner store and open the can, save half to make coffee for your pesky inlaws, set the rest of the can in the area. It sucks up the stink and if you really hate your inlaws, you can serve THAT to them on their second week of "visiting".
It only works for certain odors, like fouled meat and ciggy smoke in cars.. , does nothing for skunk or naughty pet odors...have no idea if toilet chems are one of the things it works on, but it doesn't hurt to try.