BBC NEWS | Technology | Eco glass cleans itself with Sun A revolutionary kind of glass that needs little cleaning could mean soap and chamois are binned for good.
The Pilkington Activ glass has a special nano-scale - extremely thin - coating of microcrystalline titanium oxide which reacts to daylight.
This reaction breaks down filth on the glass, with no need for detergent. When water hits it, a hydrophilic effect is created, so water and dirt slides off.