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Sequence in order of mark stubbornness :
1. Rocket blower; if that doesn't work, then
2. Lens tissue (one wipe, one tissue, don't wipe with tissue that may have dust on it - scratches), then rocket blower for stray tissue fibres; if that doesn't work, then
3. Lens pen, then rocket blower for stray lenspen dust; if that doesn't work, then
4. Dunno, never had to go this far before. Probably one of the cleaning solution options above,. Or maybe put down the lens, fold my arms and stomp around the room holding my breath til I go red in the face. Something like that.
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