Final answer:
Table salt or sodium chloride is used in washing jeans to help remove stains and brighten the colors.
Step-by-step explanation:
In washing jeans, table salt or sodium chloride is used. It is typically in the form of a brine solution, which is made by dissolving the sodium chloride in water. Sodium chloride is added to the washing machine along with detergent to help remove stains and brighten the colors of the jeans.