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Does the toothpaste on the headlights actually work? I just paid $99 to my mechanic to use some 3M thing to fix the headlights on my 04 Hyundai Accent that were quite clouded over.

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It works. My scuba diving instructor taught us, that you can use toothpaste in your scuba glasses when they get hazy all the time.

Spit also works, which is handy when you are in the sea, but not so much when you have to clean your headlights :)

What do you mean by hazy on scuba glasses? Because I don't think you mean tiny scratches and porous surface because of cleaning agents, dirt and dust (what happens with the headlights when they get "cloudy") but hazy in the sense of condensed water on the glasses (water droplets from the temperature difference). Toothpaste and spit work in this case because they are a bit greasy, and this will stop the condensation on the surface.

Sorry, I really meant cloudy.

Toothpaste, like the 3M paste, contains tiny abrasive particles that "clean" by friction. You can usually buff small plastic pieces with it by hand, but if you need to do a larger surface you need a polishing tool.

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