Sunday, February 21, 2010

Black lines on window (house) screen?

I don't mean computer window screen but the house window's screen has small vertical lines like the holes are filled with just black. What causes this? is it from cigarette smoke? (just a guess)Black lines on window (house) screen?
I am going to take a stab at this...





Dirt on the screen and then condensations builds up until a drop of water runs down the screen and mixes with the dirt and fills they hole....

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