Borescope images looked worse before I cleaned the sensor

Last month I ran a borescope down a PT6 compressor and the images were so blurry I almost called for a tear down. Turns out the lens had a thin film of oil from my own gloved fingers, wiped it with a lint free cloth and the whole inspection took 20 minutes less than I planned. Am I the only one who skips cleaning the scope tip between every single bore, or do you guys have a routine for keeping that glass clear?

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karenhenderson4d ago

The oil was from your fingers, but the blur was mostly dust and grime, so cleaning the tip before every bore is still the right call.