If you remove it, how will the helicopter know where to land?

If its a latex paint I would use denatured alcohol (try that first), If its spray paint its probaly a lacquer based so you could try lacquer thinner. Try just a liitle bit at first, if it doesnt stain dump it on there and use a wire brush and scrubb. If that dont work try m.e.k and if that dont work I dont know if anything will work.
What did you try that was super strong?
P.S. The thinners will probally remove any sealer on your driveway if thats a concern.
I agree. If you get a strong enough pressure washer you can carve off the top layer of concrete. You don't need one that strong, but a good pressure washer should have no problem with a little paint. A hot water one would work even better.3400+ PSI pressure washer should do the trick nicely. Go ahead and wash the entire area to ensure you don't have a washed H left.
