Washing clothes in cold water is the most energy-efficient method, as it significantly reduces energy consumption by eliminating the need for heating. Air drying laundry and using a drying rack are additional eco-friendly practices that conserve energy. Pre-treating stains enhances the longevity of clothing and improves washing efficiency. It’s advised to use less detergent—approximately two tablespoons for a large load—because overusing detergent can lead to residue buildup, which may cause allergic reactions. Concentrated detergents should be preferred, but laundry detergent sheets are ineffective and wasteful. Overall, sustainable laundry practices align with optimal cleaning outcomes.