Have you ever scratched a reflector by trying to clean dust or finger prints?

LED Flashlights – General Info
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Isopropyl alcohol works well but even better is 99% pure anhydrous (free from water) isopropanol.

The added water of the 70% to 91% isopropyl variants is not deionized, nor distilled, and almost always contains salt compounds in the form of bittering agents to help prevent consumption of it by people.

99% isopropanol can be found at the drug store.

A final rinse of the reflector in distilled water prevents mineral deposits from being left on the reflector surface.

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In theory, acetone should also work well. It's hydrophylic but may not be safe for plastic reflectors.

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Aluminum reflectors have some kind of plastic/clearcoat finish. Acetone works great for removing it, not so great for cleaning.

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I wonder how well it works on fingerprints…my guess is not to well however it probably does wonders for camera sensors.

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I don’t see why you couldn’t do the same thing with some latex paint thinned down with mineral spirits