Oh no, a nail polish spill on the sofa can feel like a real panic moment, but there are definitely steps you can take to tackle it! The provided search results weren't very helpful with the actual instructions, so here's a general guide to help you out.
The most important first step is to test any cleaning method on a small, hidden spot of your sofa's fabric to make sure it doesn't cause any damage or discoloration. If the spill is fresh, gently blot it with a paper towel to soak up as much as you can. If it has already dried, you can try to carefully scrape off the hardened excess with a dull edge, like an old credit card, being careful not to spread it.
For the stain itself, a solvent is usually your best bet. Acetone-free nail polish remover is often recommended because regular acetone can damage synthetic fabrics. Rubbing alcohol can also work well. Moisten a clean, white cloth with your chosen solvent—don't pour it directly onto the sofa. Gently dab at the stain from the outside edge working your way in. This helps prevent the stain from spreading. Keep dabbing with a fresh section of the cloth until the polish is lifted.
After the stain is gone, you'll want to remove the solvent. Blot the area with a different cloth dampened with a little bit of cool water. Finally, pat the spot dry with a clean towel. If you have a very delicate sofa material like silk or velvet, it might be safest to call in a professional upholstery cleaner.
