I haven't seen it for years and it has just dawned on me that it has been missing off price lists since i'd say 1995 if not even earlier.
I've still got a small square in one of my bathrooms mirrors and it still works.
It does this by being able to change the surface tension of water thereby not permitting the vapour to condense on the film.
I only ever did one job in it.
Any feedback appreciated.
Devil
