Peppermint in anything you use will also help.
Here is a remedy I use when my scalp itches, especially when I have braids or twists.
1-2 drops of pepermint oil
3-4 oz of water
I put this in a small spray bottle and spray my scalp. Be careful of how much peppermint oil you use because it is very strong. Start our with 1 drop then add as you feel accordingly. I would try clarifying the scalp first and then if you still have the itchiness this should help.