I use lacquer thinner, which is pretty nasty stuff, but it works easily ten times as fast as isopropyl alcohol for removing marker ink. If I put a single drop of LT over a Sharpie mark, I can see the marker disappearing into the clear liquid.
Nasty stuff, as in sucking the oils right out of your skin. The pads of my index fingers are calloused and dry from lightly rubbing the thinner over the side of a blade to remove all the marker marks! A tiny bit on a Kleenex or a paper towel will wipe away quite a bit of marker ink. I would think Brake Kleen and acetone would work as well, but I haven’t tried them lately. Any one of them would be a flammability concern, if you’re worried about your eyebrows.
I always have spritzers of lacquer thinner and isopropyl alcohol on my work bench. Because of their low boiling temps, I often use them to cool off edges I’m grinding on. Seems to work as well as a bucket of water.
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