#photography nerditry:
Dust is the enemy, especially on digital sensors. Prevention is easier than cleaning.
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I keep lens and body caps on until the last possible moment, and use a filtered blower bulb as the last step whenever the sensor or rear lens element is exposed. Always.
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Cleaning lenses: first use a blower bulb. If that fails, Pancro cleaner with Kimwipes, in a circular motion.
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Sensors: First step is the blower bulb. If that fails, VisibleDust solution with their swap sticks.
Battery compartment in my x700 had mild barely visible corrosion. It didnt turn on at first so I got ready to change the bulk caps but decided to give it a quick clean with a swab and what do you know, no swap needed
Still full of dust tho