At 01:57 PM 2/4/2001 -0800, Winsor Crosby wrote:
[snip]
>Many optometrist will tell you that anything with ammonia in it will strip the
>nonreflective coating right off your eyeglasses and they advise against
>Windex. I realize that an OM lens is not a pair of eyeglasses, but...
Interesting. I've noticed no ill effects on my 100/2.0 or 28/2.0, but I don't
use Windex as an "everyday" cleaner (methanol is my preferred cleaner). Each
of these lenses required the "heavy-duty" treatment precisely once. The
filters I used Windex on were a mix of coated and uncoated, and I detected no
issues there, either (in fact, I started with the filters because of just such
concerns -- better to screw up a $20.00 piece of glass than a $900.00 one...).
I suppose it's possible, though. Long ago, as a summer job I did for several
summers in a row, I was a janitor. We used to use ammonia-based cleaners as a
stripping agent for "metal-interlocked" floor finishes (the product name
"Hefty" comes to mind). Worked like a charm.
For anyone who's scared of Windex or other ammonia-based cleaners, I'd
recommend sticking to methanol/isopropanol. If it's a sticky sugar-based
problem, clean warm water ought to suffice.
Garth
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