Baader's Optical Wonder Cloth
compliments Wonder Fluid.  Baader's cloth is made from a finer grade
microfiber than the typical lens cloths sold at camera stores or eyeglass
stores.  When paired with Wonder Fluid, it is easy to keep lens
surfaces clean and working like new. 

Our Own Thoughts
on Cleaning:  Cleaning optics seems to be one of the banes of
this hobby.  Everyone has to learn their own way on this subject,
including finding their favorite lens cleaning potion.  Over the years
we've tried most of the available lens cleaners, including some touted by
friends or manufacturers as the best or residue-free, and found that most
fall short.  Very few have come close enough for our own 'picky' tastes
(some highly regarded and expensive 'high tech' cleaners have turned out to be real
duds).   We try to keep our optics as close to new as possible -
clean and free of visible residues or discolorations, even under bright
light at varying angles.  Modern multicoatings are brutal in their
ability to show the presence of tiny amounts of contaminants. 

In the end, we have
only found one solution that produces completely residue-free cleaning -
photometric grade acetone or alcohol.  Using these ultra-pure solvents
takes care and practice to achieve a pristine surface that is 
completely free of the faintest discolorations.  The effects of these
discolorations are negligible in use, so we recommend avoiding over-cleaning
in an attempt to eliminate every trace.  In general, we recommend most
amateurs stick to less aggressive cleaners, particularly since there is now
an excellent alternative - Wonder Fluid.

For detailed instructions on how to clean eyepieces and
refractor objectives with Wonder Fluid and Cloth, please click the following
link.  We also highly recommend the use of our Rocket Air Blaster to
initially remove debris and fine particles from optics, prior to the
application of fluid and cloth.