White Out can be difficult to remove from furniture. Thankfully, there are a few tricks to prevent staining.
Allow the White Out to dry completely. This should take about 10 minutes.
Scrape the dried White Out with a blunt-edged tool like a plastic butter knife. Try to remove or loosen as much as possible without pulling threads or fabric from the furniture.
Determine if the White Out is water or petroleum based. Rub it with a damp clean cloth. If it is water based, the stain should soften and dissolve with the damp rag. If the stain remains unchanged, it is probably petroleum based.
Apply a little citrus oil based cleaner with a Q-tip. Rub the cleaner and try to remove the stain. Consider testing the cleaner on an inconspicuous spot first to make sure it does not affect the color of your furniture.
Apply a little upholstery cleaner like Tuff Stuff. Spray on the foam and let it sit for 1 minute. Wipe the area in a circular motion with a cloth rag. Blot the spot dry with a dry cloth rag to remove any excess moisture.