How to get white clothes white instead of dingy? I use All detergent

https://www.thespruce.com/how-to-keep-white-clothes-white-2146392

liquid bleach or oxiclean

baking soda mixed with liquid soap adding hot water. Leave the white piece in this mixture for about 15 minutes then scrub a little bit and finish the wash. To keep my white cloths white as they were since day one, I always wash them adding 1/4 of bleach to the normal detergent. Or just oxyclean and definitely, the gold rule, Never ever, mix color with white when you are washing cloths.

I add a small amount of Clorox when I wash of white clothes.

If you are nervous to use bleach, try a cup full of distilled vinegar. Put it in the whites and use hot water. After that, wash again with detergent and dry.

Bleach tends to make clothes yellow and dingy over time. Also can break down some fibers. I use hydrogen peroxide when I wash my whites. Stronger and safer than bleach. Peroxide is the main component in oxygen based cleaners.

We used to buy really cheap laundry soap and our clothes were always dingy..We then switched to Gain and slow but sure the whites are making a come back. I would think All is a fine laundry soap. But.....maybe not

Add white vinegar, a cup per load of whites. Sometimes I add bleach and after five minutes, a half a cup of baking soda.

Use Oxyclean. Soak overnight if very dingy