Wash your hands before handling slides to avoid transferring finger
grease to the slides.
To remove oil from an objective, moisten a piece of lens paper with
ethyl ether and slowly draw the wet paper across the front surface
of the lens.
c. To remove dirt from an eyepiece, breathe on the lens and GENTLY
wipe off the condensed water with lens paper.
d. Get help if these steps do not solve your problem.