Co-wash, deep condition, airdry about 60-70% then put in Coconut oil, then finish airdrying completely.
Worked for me when I bleached my extensions platinum blonde ( and I mean the platinum-est of them all ). My nape felt like straw because it was hard to get back there when washing in my sink. Girl I had to turn my head ALL the way and was finally able to get a good wash, even though I wet up everything. Now it's conditioned and moist like the rest of the hair.
Then again, I also used Organix Keratin Oil Conditioner (in the raspberry bottle). God's gift, plus the smell lingers after a few days & it smells so good.