What you will need:
3/4 Cup Dawn dish liquid (blue)
3/4 Cup washing soda
3/4 Cup Borax powder
Hot water
One Gallon container
Measure out the washing soda and pour into the gallon container. Then, the Borax. Get about 3 Cups of hot tap water and add to the washing soda and Borax mixture. Be sure to screw the lid on tight and shake. Pour more water into the container until almost full and add the blue Dawn dish liquid. Finish filling container with water. Secure the lid again. Roll the container to mix – DON’T SHAKE! The soap will bubble if you disturb it too much. Use 1/4 Cup in your laundry like any other detergent.
https://clark.com/family-lifestyle/diy-laundry-detergent-save-money/