This is one problem all School going children face in life.
Tip 1:
Take 2 tblspns of Vinegar and dilute with 2 tblspns of water. Apply and leave for an hour before washing well.
Tip 2:
Take a cup of coconut oil and add 1 tblspn of crushed camphor to this. Heat the oil till camphor melts. Apply well on scalp while the oil is still warm. Leave for 1 hour before washing.
Tip 3:
Make a paste of basil leaves. Apply the paste all over the scalp. Drape a towel and leave overnight or at least for 2 hours. Wash.
