Cut a towel into eight equal lengths. Fold the towel in half, lengthwise, and then cut it into four identical strips. Stack the strips on top of each other. Cut down the center, turning each strip into two equal sized pieces.
Set your sheets inside a plastic food storage container.
Fill the storage container 2/3 full of liquid laundry detergent. Wait until the sheets have absorbed all of the liquid detergent. Add more detergent, a little at a time, until each sheet is wet but not dripping with detergent. Put the lid on your container, making sure it's tightly sealed.
Toss one laundry sheet into the wash machine for each load of laundry. For heavily soiled clothing, use two sheets.