What is the best way to remove nicotine from painted wood?

To remove nicotine from painted wood, start by mixing a solution of warm water and a mild detergent or white vinegar. Use a soft cloth or sponge to gently scrub the affected areas, being careful not to damage the paint. For stubborn stains, a mixture of baking soda and water can be applied as a paste, left for a few minutes, and then wiped off. Always test a small, inconspicuous area first to ensure the cleaning method does not harm the finish.