Exactly what is self cleaning glass?
Self cleansing glass is glass which has actually been thinly coated with titanium dioxide, an inorganic pigment that is made use of in a range of items including sun block (mirrors UV rays), tooth paste and as a whitener in white paint.
To place it just, it uses a dual-action process where organic dust is broken down by daylight and is then cleaned away by rainfall, hence making it easier to maintain clean.
More regarding exactly how it functions
Self cleansing glass works by 2 processes:

Photo-catalysis - the activity of sunlight onto the surface of the glass consumes away dust. It does this by absorbing the UV element of sunshine which then breaks down any organic material on the surface of the glass.
Hydrophilicity - rather than creating droplets that diminish the home window in rivulets leaving touches, the rainwater spreads out as a continuous sheet cleaning the glass clean.
Does it constantly work?
Jeff Howell, exploring the advantages, По-вдъхновяващи идеи and disadvantages of self cleaning glass in The Telegraph (June 27th 2005) wrapped up that self cleaning glass is "self-cleaning as long as it doesn't obtain unclean."
Whilst self cleansing glass definitely performed well in laboratory tests the exact same conditions rarely use in genuine life. If rainfall is lashing versus one side of the home, the other will certainly continue to be fairly dry as well as therefore unwashed.
Jeff interviewed one producer of self cleaning glass who confessed that their item is just "self-cleaning" as long as it is on a regular basis hosed down with water, as well as even after that it works ideal when the water flows gradually down a slope - such as on a sunroom roofing system - rather than directly down, as on typical vertical windows.
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Whilst self cleansing glass definitely done well in lab tests the same problems rarely apply in real life. Just how often do upstairs windows, protected by lintels, arcs and eaves obtain truly saturated by rain? If rainfall is lashing versus one side of the house, the other will definitely remain relatively dry and also consequently unwashed.