Purchase a chlorine bleach product that is made for use with laundry. Check the label instructions to be sure.
Read the label on the product carefully. Most manufacturers will provide specific instructions for the safe strength of their bleach product with laundry.
Measure out the amount of bleach for the washing machine that is safe to use with the clothes. In many cases, the strength indicated will be about 8 oz. of bleach per 20 gallons of water. This is a 1:300 ratio.
Add the bleach to the wash along with your regular laundry detergent. Allow the load to run through the full rinse cycle to be sure all of the bleach is rinsed away.