I bought a 3 pack of this cleaner. Within a week of just sitting in my pantry, 2 of the cans were empty and one partially so. It seems there was a flaw in the caps that allowed the air to leak out once the tab at the top was broken off. Firstly, I don't know why compressed air is so expensive. And secondly, why can't some of the enormous profit they must be making be put to making a cap that keeps the expensive air in the can.