"N. Thornton" wrote in message
om...
Timothy Murphy wrote in message
...
I read several years ago that Pilkingtons had developed
a new kind of glass, with some kind of activated surface
which kept the glass clean.
IIRC, the glass was intended for use in very tall buildings
where it is impractical to clean from the outside.

I wonder if anything came of this?

I knew a window cleaner that saw a factory done in this, said every
time he went past it it was filthy. IIUC it speeds up oxidisation of
bird ****, so it has some clean-enhancingness, but is by no means
fully self cleaning.

Mind you, he would, wouldn't he :-)