If you order your windows before March 1st, 2013, you will be eligible to get free solar clean on your windows.
The Solar clean glass is a permanent titanium dioxide layer that is part of the outer glass surface. After installation in your home the sun’s ultraviolet rays breakdown dirt and debris on the glass, which rain will then wash away. And the best part is that there is no spotting or streaking on the windows. And all is powered by nature.