How to wash a yellow backpack

There are several ways to clean the yellowed part of a backpack:

‌Wipe with alcohol‌: Spray alcohol on the yellow stain, then gently rub it with an alcohol wipe, and the yellow stain will disappear. But please note that alcohol may damage some leathers, so it is recommended to do a small test in an inconspicuous place first.
‌Use neutral detergent‌: Mix neutral detergent and water in an appropriate proportion, dip a soft brush in the mixture and gently scrub the yellow stain. After cleaning, rinse with clean water and wipe dry with a clean towel.
‌Use toothpaste‌: Squeeze a small amount of toothpaste on a soft brush and gently scrub the yellow stain. Be careful to use moderate force to avoid damaging the surface of the bag. After brushing, rinse with clean water and wipe dry with a towel.
‌Use bleach‌: For bags made of pure white fabrics, you can use bleach diluted 1:10 and scrub the yellow stain with a toothbrush. Note that bleach may damage non-white fabrics, so be careful when using it.