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You can, if necessary, drag a cotton ball over the surface if needed to dislodge the dirt but after you have tried the advice below. Cotton ball should be soaked in the water/soap solution and discarded after a single pass for a new one. Don't put pressure on the surface just drag it over. Rinse with distilled water and use a puffer to blow off remaining drops. Allow to dry in a dust free place - do not use a hair dryer.
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