A substance used to remove nail polish:try olive oil and acetone-free nail polish removers for clean and healthy nails...
To help prevent the spots, keep your nails in top form by moisturizing them nightly with lotion and limiting the amount of nail polish remover or harsh soaps you use.
Don't use nail polish remover more than twice a month.
If you use nail polish, use nail polish remover sparingly because the acetone can damage your nails.