I have a whole cabinet full of Chinese 'Dime-a-Dozen' paperweights, and I have nothing against Chinese glass with regards to style, craftsmanship, whatever. But THIS is what I have against Chinese glass!
These weights were last washed in warm water and vinegar just 18 months ago, and today I had to do the job again, plus wash the glass door and shelves and the mirror back of the cabinet I keep them in. Incidentally, it seems as if keeping them in the cabinet is what accelerates the reaction, as we have surmised when discussing this previously. (The only film on the ones I keep outside on the top of the cabinet is dust!
Funnily enough, the 'older' Chinese weights in my second picture were not affected at all, in spite of being in the same cabinet for the same length of time :huh:
However, the worrying thing is that a couple of the worst affected weights have developed bulls-eye 'bruises', in spite of not having been knocked, which would seem to indicate that there is an internal effect as well as the 'cloudyness' on the surface, which washes off easily
I'd love to hear a proper scientific explanation for this!