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(ednote: one of the best investments one can make is to get a skylight or uv filter (if possible), and just keep it on all the time. If you mess up the filter, you can always replace it. Much less expensive than a new lens!)
(ednote2: another convenient way to clean a lens is to use a LensPen. These cheap (~10$) tools have bristles on one end, and a moisturized cleaning pad on the other end. First, brush off any loose debris from the lens/filter, then gently in circular strokes wipe the lens/filter using the moisturized tip. Once the moisturized tip no longer works, invest into a new lens pen.)
»Does Anyone here use a Lens pen?
(Links fixed. --kc)