
Remove hard water stain from Eye glasses
In article
Quote:
> The other week I noticed my eye glasses had dried hard water stains on
> them. This seems to have accumulated over time. My lenses are glass
> lenses (not plastic). I thought that the lens cleaning solution you
> get at the optical stores would do the job - that did not help. Also
> tried vinegar, but no success. Is there any to get rid of these dried
> stains. If not, the option is new lenses. Appreciate any advice.
> Thanks.
If you truly have HARD WATER stains, I am hard put to come up with an
idea of what the source of your problem can be. The usual hard water
arises from dissolved calcium bicarbonate that turns into insoluble
calcium carbonate upon heating heating or exposure to the atmosphere.
That material, however should be easily removed with a weak acid like
vinegar. "Permanent" hard water will usually arise from totally soluble
minerals such as magnesium sulfate. They will interact with ordinary
soap to make a poorly soluble soap. Could that be problem? That is, have
you tried to clean your glasses with soap?
Beyond that, there may be some rarer kinds of hard water such as
dissolved iron. Upon exposure to air, a valence change may occur that
oxidizes the iron into an insoluble form (rust). That is not likely.
You should be able to get a list of impurities in the water from your
water supplier.
Bill