Patsis Glass S.A. is proud to be the first distributor in Greece to offer the latest achievement in glass technology....self cleaning glass. Pilkington Activ is an ordinary glass with a special surface that has a unique dual-action, Once exposed to daylight, the surface chemically reacts in two ways. First, it breaks down any organic dirt deposits and second, rain water 'sheets' down the glass to wash the loosened dirt away.