Hi Zuiks,
I just performed a simple experiment on my bathroom mirror. With 91%
isopropyl alcohol and toilet tissue, I could see a slight residue after the
alcohol had dried (I put it on sloppy wet and didn't wipe dry). With 99%
isopropyl alchohol, there was no residue visible upon drying. The difference
was very apparent.
One thing that was apparent with both versions of alcohol, though, was a lot
of paper fibers or "dust" left behind by the TP. TP is not a good choice for
optics.
If you read the labels, you can usually find various percentages of purity of
alcohol at your local drug store or major chain store. My local Fred Meyer
has at least two choices. Most hardware stores & good paint stores should
have denatured alcohol. Right in there alongside the paint thinner, lacquer
thinner, kerosene, etc.
Perhaps the MOST important factor, whatever one uses, is to emphasize
"GENTLE!" The mirror is a delicate, precision component. Both the mirror
surface and the alignment of the mirror itself is easily damaged/disrupted by
"numb fumbling."
My OM-2S mirror has a funky corner or two. I'm leaving it the heck alone.
YMMV.
Rich
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