I just went a whopping 17 days without washing on account of being on vacation (I was using a lot of dry shampoo, so it cooperated).
I've finished washing and am currently deep conditioning. My scalp is breathing a sigh of relief
I didn't bother pre-pooing because my hair already was oily, so I just shampooed thoroughly with Skala Jaborandi, followed by a second lather with Skala Ceramide G3.
For deep conditioning I've created the following mixed cocktail (a scoop is a regular plastic spoon):
2 scoops Oscar Blandi Marine Mud Treatment masque
2 scoops Skala Ceramide G3 masque
2 scoops Skala Lissative masque
1 scoop organic jojoba oil
Applied to hair in sections. I think I have enough left over for another application. I put on my plastic cap and am now letting it sit at least 40 minutes, no heat.
Then rinse and the usual blow dry and flat iron. I'll probably also trim tonight.