First, try clarifying your hair with a good clarifying shampoo (Elucence clarifying poo, mizani puriphyl poo, Nexxus aloe rid, or even Kenra clarifying poo - these are only examples of course) to remove excess buildup on the hair, just like the girls recommended earlier. Next use either Roux porosity control to put moisture balance back in the hair. If you don't have this then a good temporary porosity control is apple cider vinegar which helps to bring the Ph balance of your hair back in sync. To use this, simply mix 2oz ACV to each 8oz water and pour over hair after you're done poo-ing.
Then use a very good moisturizing conditioner and deep condition your hair for at least 45 minutes to an hour under medium heat under a hooded dryer. I use Mizani Moisturefuse or Kenra moisturizing conditioner, or Keracare Humecto, or Pantene Relaxed and Natural Breakage Defense Hair Conditioning Mask.
Try not to use any other heat styling for a long while. Your hair does not need heat at this point as heat sucks out moisture from our hair like a vaccuum.. Air dry your hair as much as possible because this is your recovery stage. Remember, it is very important to clarify your hair at least once or twice a month especially if you are co-washing and using daily moisturizers regularly. These products build up and blocks the needed moisture to the hair shaft.
Also remember to deep condition the hair once a week or at least every 2 weeks if you can with a good moisturizing conditioner. This helps to retain the moisture your hair needs. Everytime you use a protein treatment of any kind, follow it up with a deep moisturizing conditioner to soften and restore moisture to the hair. Your hair's moisture level will be back in no time. Be patient with it and give it a lot a love.
Of course, you know if you need any further help, just come right back in here and ask, we will be more than happy to assist, right girls? We are all here to help each other.
Just a note of caution, our hair does not need a whole lot of protein conditioners but it does need a lot of moisture because it is dry. Use protein products if your hair is showing signs of excess breakage and stretch. Your hair could be sensitive to proteins. Watch it carefully as you go through your hair journey, okay?