I'm not so sure about using any windex. First, it has ammonia, which
is known to etch some coatings. Second, it has that blue dye.

Photoflo will insure no spots are left. If the alcohol doesn't get
diluted, then you won't have spots because alcohol will evaporate. The
caveat is I've only used the pure alcohol on filters, and maybe lenses
are different.

pol haut wrote in message ...
cut the 99% alcohol to 40% and add 10% filtered windex plus one drop only of
photo flo .....filter it all using coffee filters. Its easy on coatings and
wonderful lens cleaner - fully tested by several obsrvatories of note. Maybe
someone has a better one?

Ive always wondered what Chris recommends? Have never seen him
post on this but he must recommend something for his fine apo's ?



MD wrote:

Is it true that a 50% solution of 99% isopropyl alcohol and distilled water
(1:1) makes
a good lense cleaner? Does it affect coatings?