If you’re dealing with overspray that covers the entire car or has been baked on by the sun for months, DIY may not cut it. Some autobody shops offer “overspray removal” services using ultra-fine wet sanding or specialized compounds. It’s not cheap, but neither is repainting a hood.
Also, if your car is a vintage beauty with original single-stage paint (no clear coat), proceed with extreme caution. The solvent in removers can lift the color right off. In that case, just do a light clay bar pass and live with the faint marks—like beauty marks on a star.
Finally, don’t sweat the small stuff. A little overspray on a car you drive daily is like a stray popcorn kernel in a movie theater seat—annoying, but not the end of the world. You have places to go, and your car isn’t a museum piece.