链接： http://www.astro-tom.com/tips_and_advice/cleaning_optics.htm
内容：
Before deciding if you actually need to clean your optics, read these
instructions ALL of the way through first. Here are two very informative
articles on how to clean mirrors, eyepieces and filters. These are in the "
Must Read" category if you are thinking about cleaning your optics!!
UNDER NO CIRCUMSTANCES SHALL ANY USER OF THESE INSTRUCTIONS HOLD ASTRO-TOM.
COM OR THE MANUFACTURERS OF ANY PRODUCT MENTIONED HERE LIABLE FOR
