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i use a cleaning cloth first of all/ or a blower/brush for cameras - that usually fixes the easy problems (make sure you keep the cloth clean if using one)
for more difficult problems or if it has water marks you could try distilled water - i usually use cotton buds, then wipe with a soft cloth
for really bad stuff alcohol / acetone may be required, keep in mind it has been suggested by some acetone can damage coatings of good ep's, i have not had any problem though
to finish off the above usually a firm breath and wipe with soft lens cloth usually is good too ( this also fixes the most basic blemishes)
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