How can I effectively remove plywood stains from my furniture or flooring?

To effectively remove plywood stains from furniture or flooring, start by gently sanding the stained area with fine-grit sandpaper. Then, apply a wood stain remover or a mixture of equal parts vinegar and water to the stain. Let it sit for a few minutes before wiping it off with a clean cloth. Repeat the process if necessary until the stain is removed. Finally, finish by applying a wood polish or wax to restore the finish.