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Interesting, I was told several years ago (by a Marine) that the original name was "Duck" tape because of the Vesta Stoudt story at the beginning of the article. She applied an adhesive to "cotton duck" fabric (canvas) thus "duck tape".
Although I have not tried it, I have been told WD-40 is effective at removing spray paint (graffiti) from a car if applied within a few hours.
Vinegar does great at removing rust from small tools so I believe it would also work well on a bike chain. Just place the chain in shallow dish or pan or a deep narrow container (I cut the top off a tall water bottle like Smart Water) & cover the item with vinegar. Let it sit for an hour or two or overnight then just rinse with water & wipe any remaining rust off. A second soaking may be appropriate on heavy rust.
LEDs and Lighting Class
Excellent. Also works for your car remote. Can save more than $100.00 on new key fob.