Tell us about yourself!
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.