Oh, I didn't realize it was the tanks that would collect moisture - makes sense.

I'm always amazed how some people can go so long without any kind of PC maintenance and not have problems. We at VDR are probably a little excessive on the cleaning - you'd think we'd never have problems given how much we care for our PCs!

Yeah, by itself the canned dusters aren't THAT expensive. But I hate to throw away the cans (not all recycling centers take aerosol cans) plus I don't like the way they get so cold, and it's risky to turn it even a little to the side I've found - blows out that liquid.