What household item did you ever purchase that turn out to be a waste of money.

My husband bought an air purifing ionizer. It did do what it said it would do but after a while your home smells like peroxide and people start to get headaches and asthmatics feel unwell as well. In the long run you end up feeling worse when all you wanted to clean the air in the room so you would feel better.
So what have you ever purchased that you felt was a waste of cash?