 The CDC states that swimming has no effect on lice, and can decrease the effectiveness of some treatments.After treatment, people are often instructed to wash all bedding and vacuum all areas the head may have been, such as car seats, coat hoods, and sofas, but this is not always necessary, since adult lice will die within 2 days without a blood meal, and newly hatched lice die within minutes of hatching.Combs and brushes may be deloused in boiling water for 5–10 minutes.