Quote Originally Posted by photomc
Must admit, I am a little confused how a burst from a can of compressed air can make such a difference....
Probably because there is very little air in a can of compressed air. There is a high concentration of hydrocarbons and very little Oxygen. In the absence of oxidizers, the solution will stay fresher. Additionally, there is very little CO2 in your exhaled breath. True, it is higher than in your inhaled breath, but oxygen, the culprit, is still up there around 20%.