what have i learnt so far?

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Across
  1. 3. shampooing technique
  2. 5. removes waste by osmosis
  3. 6. massage technique
  4. 8. needs changing after solution application
  5. 10. massage technique
  6. 11. smoothing treatment
  7. 13. must be attempted during every blow wave
  8. 14. perming and straightening
  9. 21. brush
  10. 22. what hairs is made of
  11. 23. keep hold of this when winding a perm
  12. 24. brush
  13. 25. must be followed every time
Down
  1. 1. must be used in every blow wave
  2. 2. wrapped around the hair before winding a perm
  3. 4. done with every conditioning treatment
  4. 7. your best friend when blow drying
  5. 9. sectioning
  6. 12. start and finish your scalp massage with this
  7. 15. the process of neutralising
  8. 16. must be completed for every client
  9. 17. we don`t want to be doing this when shampooing
  10. 18. outer layer of the hair
  11. 19. the process of perming or straightening
  12. 20. where all chemical changes take place