nail polish streak on screen - how to remove?

Nail polish remover is an extremely strong agent, I would seek professional advice first from an Apple store. You would hate to remove the nail polish, but then be left with a "bleached" spot on your display, that will be impossible to remove

Is your Macbook Pro one of the newer unibody models with the glossy screens? If so, you may try some rubbing alcohol on a cotton swab to try and remove it. Not sure about nail polish remover -- that's basically acetone, which will eat through pretty much anything. It's safe on glass or metal, but I definitely wouldn't use it on a matte display, and would be hesitant to use it on even a glossy LCD panel since there may be a surface coating that isn't evident.

If you have a matte screen I would try something like iKlear, or a cleaning agent specifically designed for LCD screens. I would be very wary or using rubbing alcohol or any other solvent on a matte screen.

Here's a thread bump.. I wouldn't think it would do any damage but I'm not sure what kind of coating is on the screen.

I think you should be fine with nail polish remover...just don't drip it all over the place. Maybe put a small amount on a q-tip and try. Anyone else have opinions??