Self-Cleaning UV Glass   Self-Cleaning glass is essentially the same as conventional glass except for a dual-action coating on the outside. This coating uses UV rays from the sun to break down and loosen organic dirt and then uses rainwater to wash it away. Water also drains faster off this glass, reducing watermarks and streaks left on the glass to provide clear views of outside. This self-cleaning glass is ideal for external glass surfaces such as roofing or conservatories and is available in clear, blue-tinted or bronze-tinted variations.