Spraying poison in the house only spreads poison to all family members and pets. Lice wish to remain on the hair, not on carpets, couches, etc. Rather thoroughly vacuum the rugs and furniture seeking any hair strands that may have fallen from the head or lice that may have accidentally fallen onto pillows.
Any item that is difficult to wash such as couch pillows or stuffed animals, may be placed in a hot clothes dryer for 15-20 minutes to kill any lice or eggs. Be certain to change and wash the bedding and clothing from all members in the household on the same day Schooltime Shampoo was applied to the hair.