ClearShield, since 1981 What is ClearShield?

ClearShield is a polymeric resin that bonds chemically with the glass to form a hydrophobic (water hating) coating on the surface of the glass. The coating is inert, transparent and non-hazardous but it causes the water droplets to bead up and run off the glass more readily than they do on ordinary glass, leaving less water behind (and any soap, limescale, bacteria or other residues). Consequently, far less cleaning is required to keep your shower screen looking like new.

Benefits of ClearShield:

Further reading (Click on the links)

Technical information on how ClearShield works
About the manufacturer (Ritec, a UK company)