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Back in 1965 my company bought a new Tektronix storage oscilloscope. Tek sent out a technician to give us a class on maintaining the new oscilloscope. He advocated cleaning the chassis periodically with a spray of water. We were floored, but he assured us that was the right way to keep things clean.
We never used water to clean the unit the entire time we owned it. We did use compressed air to blow out the dust from time to time.
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