Had the hood, scoops & cowl painted "gloss black" and my painter apparently got some clear overspray on my windshield. How do I remove the overspray?

Try a razor.

0000 steel wool works, too, but don't use it on mirror glass, and blow off or wash off the steel wool residue.

If still pretty fresh, a rag with lacquer thinner should work. Be very careful not to spill any on or touch the rag on the fresh paint.

Spray brakleen or spray carb cleaner on a rag will take it off too.

or polishing compound

They make a clay called overspray clay from Meguires. Designed to lift off light overspray and not cause consequential damage.

Glass cleaner and a brand new razor blade.

I've used a regular clay bar on glass with good results.

Take a single edge razor blade, mark one side, use that side up and polish it against a piece of glass with edge on glass, apply pressure, rotate in circular motion. Your blade is now honed and will clean glass with no damage.

I would start with the least aggressive and proceed thru the scale getting more aggressive if needed. Light overspray I used a polish or compound.

can you take it back to the painter?

Lacquer thinner has worked for me before. As mentioned be careful. Keep the can of thinner far away and put a small amount - finger size - on a fresh rag to remove the overspray. That way you will not damage the paint.

A razor blade used carefully is good also... especially on edges where you don't want lacquer thinner to hurt rubber or paint.

In my shop we use a foam type window cleaner, lots of it and a razor blade