Stains stemming from nicotine usually disappear after washing in water with detergent.
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If, however, they are very persistent, then rinse them with water and vinegar first, then wash in water with the addition of alcohol and washing powder. If it does not help, then wipe the stains with a cotton ball soaked in diluted Perchlorate. For white fabrics, you can wash the stain by using raw egg yolk mixed with denatured alcohol. You can also wash them in oxidized water or denatured alcohol. In case of colored fabrics, determine first whether there will be any discoloration. After such treatment, the fabric should be traditionally washed.
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