Rub the denim stain with a towel. This absorbs any liquid still left in the stain.
Gently rub the stain with a pencil eraser to remove as much of the surface stain as possible.
Brush the nubuck shoes with a suede brush. This restores the nap of the nubuck.
Pour white vinegar onto a clean cloth.
Rub the cloth into the denim stain to apply the white vinegar. Continue to scrub the shoes to remove the stain. White vinegar removes stains that a pencil eraser can’t. Vinegar has acetic acid that gently cleans nubuck and suede.
Let the nubuck shoes air-dry.