Pour cat litter over the laundry detergent spill. Cover the detergent completely with the litter, adding more as the detergent is absorbed. Allow the litter to absorb the detergent for 20 minutes.
Scoop the cat litter off the cement floor with a shovel. Repeat until the litter absorbs no more detergent. Sweep up the last application of cat litter to remove it entirely.
Wipe as much residue as possible from the cement floor with dry paper towels.
Moisten a scrub brush with water. Scrub the last trace of laundry detergent on the floor. Pour cat litter over the soapy lather to absorb it. Sweep up the litter after 20 minutes.
Rinse your cement floor with a hose or bucket of water. Blot the moisture with rags to dry the cement. Allow the cement to air-dry the rest of the way.