Wipe wet paint spills off the white trim with a damp cloth. Turn the cloth to a clean spot, and wipe again to remove any residue. Because latex paint is water-based, it cleans up easily with water while still wet.
Scrape dried paint splatters gently with a razor blade. Hold the razor blade at a 45-degree angle, and scrape slowly but steadily so you don't gouge the trim.
Sand the area lightly with sandpaper to smooth it and to remove any remaining paint residue. Touch up the trim with new paint, if necessary.
Spray the paint spots with a citrus-based cleaner, and wait 10 minutes as the cleaner softens the paint.
Rub the spots gently with a plastic scrubbing pad to remove them.
Wipe the area with a damp cloth to remove any cleaner residue.