Hi Cat. The only eco friendly shampoo for wetsuits and other water gear I know of is Slosh. Slosh contains NO harmful chemicals and helps you remove salt, chlorine, odors & organic residue from neoprene. It also contains special disinfectant and conditioning agents that help preserve and extend your equipment’s life. The only thing more eco friendly is water:) which actually works most of the time (you can find a few washing tips here).
If you want Slosh, you can buy it here.