I think it would be next to impossible to get a good result. If you ground it off you could see it was ground off. If you painted it, it would need new paint and....
How big is your driveway? Maybe the best solution would be to break it out and then replace it with new concrete.
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"I am a great believer in luck, and I find that the harder I work, the more I have of it." -Thomas Jefferson
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