Lift each bra out of the laundry basket, and hook its straps together. This prevents the hooks from catching other clothing.
Place the bras inside a pillowcase. Use one pillowcase for three or four bras.
Fold the pillowcase like an accordion five times, beginning at the top. Secure the folds with a safety pin, to prevent the pillowcase from opening during the wash cycle.
Add the pillowcases to the washing machine, after putting in the detergent.
Remove the pillowcase from the washing machine, after the cycle completes, and remove the safety pin.
Hang the bras to air-dry, to prevent them from getting tangled in the dryer.