About every three days. I just don't want to wash it more than that, so I'm learning how to make it look decent in between washes.
3a/b, fine, normal porosity, high density
Wash: CJ Daily Fix, As I Am, TJs TTT
LI: Suave TC + CJ CCCC, brushed through with Denman
Styling: Smooth in LAL Wet Look gel, scrunch, and plop 10 minutes, then add a little more gel, cover with silk cap, and sleep on it
Refresh: 3:1 water/Suave mix as needed
I cowash weekly and shampoo once a month or as needed- which ever comes first. I can't exclusively cowash because my hair gets weird and dull and my scalp gets just itchy and nasty. But I can go at least a month with no shampoo.
Have you tried doing brown sugar scalp scrubs? They really cut through scalp buildup well. Just add 1 tablespoon of brown sugar to the conditioner for one co-wash, then give yourself an extra good scalp massage with it.
Baby Fine 3B, low porosity, normal density and elasticity
CGing since July 2008