What does that have to do with air spray?

In itself quite well to remove superficial dust, but no air but a propane / butane is in the tank mixture. Since the mixture in the bottle in liquid occurs as it exits the bottle for rapid expansion and cooling, so that the ambient air humidity ices to the treated areas. For cleaning electrical circuits / components of this spray is very unfavorable because condensing humidity can lead to short-circuit. The spray One should therefore use only the equipment is switched!