seaweed shampoo?
seaweed is a food (nori, traditional sushi wrap, drank "dulce" as a drink in Belize mixed with nutmeg and cinnamon, and as a salad dressing) a medicine (for thyroid function and to prevent goiters) and as a shampoo (by Bumble and Bumble)- duh.
Bumble and Bumble's Seaweed shampoo is ideal for the lazy latherer because the bottle says no need to repeat. It doesn't have the itch of stuck-on-you in the ocean-am-I-going-to-have-sealice and it does have the most deliciously clean scent of any shampoo.