Can't get scalp clean

Just like the title says can't seem to get my scalp clean.  Within 1 day of washing it is itching and starts to get oily.  I wash every 3-4 days using vicki's liquid tea tree shampoo. I have started to try ACV rinces/soaks before washing, but have only done that once so may need more time to work. I wear hats a lot which may contribute to it. I have thought about using a scalp brush like this 

https://smile.amazon.com/dp/B003H7DCYY/ref=sxr_pa_click_within_right_3?pf_rd_m=ATVPDKIKX0DER&pf_rd_p=2329824862&pf_rd_r=ZM75RV5VN8HDXPMEQ5YK&pd_rd_wg=KKaZR&pf_rd_s=desktop-rhs-carousels&pf_rd_t=301&pd_rd_w=y6P83&pf_rd_i=scalp+exfoliator&pd_rd_r=2RKNWZPBRZ81QFRCZCX0&psc=1&smid=AYSI9CNL93O4X 

but not sure if it would help. The one week I had a great scalp was after swimming ini a chlorinated pool, for 5 days after my scalp was awsome. I may just need to go to the pool every week lol.  

acv might make it more oily

vickis detox might help (ask her about it) wash in hot and then do a cold as you can stand rinse

really do that cold long  as u can rinse to seal the pores

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My new book Ban The Taboo Vol 1

ugg I hate cold water, but that makes since why the pool worked so well it was definitely on the chilly side.