You need to look for a shampoo that is both sulfate and silicone free as well as a conditioner and styler (if you use them) that are silicone free.
It will take a lot of label reading and probably trial and error to find ones that work so you don't get build up.
I personally love the Shea Moisture Coconut and Hibiscus Curl Shampoo but I only use it weekly. I mainly use the Suave Naturals Rosemary and Mint clarifying Conditioner and have yet to see build up.
We are experiencing our "second winter" in SEVA right now so I'm in fluff mode but have been able to keep it manageable fluff so it's not too bad.
3B - Fine/Norm - Norm Elas/Por - Protein friendly?
Weekly Low-Poo: SM Coconut & Hibiscus Curl & Shine Shampoo
Rinse-Out: Suave Naturals Rosemary Mint
Leave-In: SM Coconut & Hibiscus Curl and Style Milk - Giovanni Light Leave In*
Style: Curls Goddess Curl Gel* SM Coconut & Hibiscus Souffle*
For my Curly Babies:
CoWash: L`Oreal Paris Hydracharge Cleansing Conditioner
* Currently Testing