How to prevent jeans from fading

Salt water/white vinegar soaking + cold water washing + drying in the sun
The following are practical methods that have been screened based on authority, timeliness and relevance, and are classified and organized by processing flow:

1. Color fixation before the first wash
‌Salt water soaking method‌

Before washing new jeans for the first time, soak them in saturated concentrated salt water (salt grains no longer dissolve) for 30 minutes to 1 hour. Salt can solidify dye molecules and reduce subsequent color fading. If there is still slight fading, soak them in light salt water for 10 minutes before subsequent washing.

Principle: Salt combines with dye to form a stable compound, reducing water solubility.
‌White vinegar/vinegar water soaking method‌

Turn the jeans over, add 2 spoons of white vinegar (about 30ml) to the water, and soak for 30 minutes. White vinegar can neutralize alkaline residues, lock color and remove odors.

Alternative: Soaking in milk (containing protein and lactic acid) can also reduce color fading, but the cost is higher.
2. Key points for washing
Water temperature and washing method
Cold or warm water (≤30℃) must be used. High temperature will accelerate the loss of dyes.
Hand wash inside out: reduce surface friction and protect the dye layer.
Cleaner selection
Avoid washing powder containing bleach. Neutral detergent or dishwashing liquid (without bleaching ingredients) is recommended.
When the stain is light, it can be washed directly with clean water.
3. Drying and daily maintenance
Drying skills
Hang it in a ventilated place to avoid direct sunlight (ultraviolet rays cause oxidation and fading).
Turn it over when dehydrating and do not exceed 1 minute.
Reduce the frequency of washing
Wash it once every 1-2 months. After wearing it, ventilate and dry it.
4. Other auxiliary measures
Classification washing: separate dark and light clothes to prevent color mixing.
Laundry bag protection: Use a laundry bag to reduce friction when washing in the machine.
‌Summary‌: The combination of "salt water/white vinegar pretreatment + low temperature washing + drying in the dark" can significantly reduce color fading. Long-term maintenance requires controlling the frequency of cleaning and avoiding chemical damage.