Household Wisk diluted 1:100 with plain tap water.  We have used this
for years. It is excellent. We began using it on the recommendation of
the man who did the annual cleaning and maintainance of our microscopes.
It is excellent for removing oil from the glass slide as well.
Personally, I wouldn't use anything else.
Be sure to use lens paper to do the cleaning.  Don't use Kleenex.  It
has a more abrasive quality than lens paper.

I sent a copy of the note about Wisk to the Histonet group but since
this is a late reply, I am sending it to you directly as well.

William B. Tyler MD
Dept. of Pathology
Geisinger Medical Center
Danville, PA 17821