Me, personally I dilute shampoo in a bottle with some water and pour it over my head and lightly massage it in. Then rinse it out. Also, you could do an acv rinse. I haven't done this yet but I'll proabbly try it this weekend.
I use diluted shampoo and never had a problem (www.growafrohairlong.com). If you want to scrub mix some dark brown sugar with your favorite shampoo or conditioner and get to scrubbin!