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Unread 30th July 2013, 03:48 PM
PigSti PigSti is offline
on sabbatical
Join Date: Jul 2013
Location: never never land
Posts: 504
PigSti is on a distinguished road

Yes, seen a friends glass permanently etched by calcium in tap water!
I found that Phosphoric acid instantly dissolved away all calcium marks on my glass. I bought it by the litre at the hardware store. I used it to also descale my kettle and shower screens at home, it was instant and reasonably safe.
RainX is a good solution to preventing scale marks on any glass, it lasts for years so I have found.
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