Stain removal is all about speed and technique. Here's the proven method for tackling spray paint effectively.
Different surfaces need different methods. Test in a hidden area before treating the full stain.
Apply acetone or nail polish remover with a cloth to remove spray paint from metal surfaces.
Apply commercial paint stripper, let sit per instructions, then scrub with a stiff brush. Rinse.
Spray WD-40 on fresh spray paint, let sit 5 minutes, then wipe off. Works on many surfaces.
For outdoor surfaces, pressure washing combined with paint stripper is highly effective.