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Anonymous
>>289666
A lenspen. Use the brush side to sweep all particles off and if you have to then use the pad to clean. That way you don't rub hard sand or something into the glass with the pad. They are cheap and portable and last for years. They fit in your shirt pocket.
This kind of thing: www.lenspen.com
You can get them anywhere online or in stores. Before getting them I used to carry a small leather wallet of lens cleaning tissues and a small soft brush, which did the same job in a less convenient package.
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