Natural Sea Material for Scrubbing the Body Clean

Puzzle 5 of Alternatives to Plastic Pack

Question is: Natural Sea Material for Scrubbing the Body Clean

and the answer is: SPONGE

Word Meaning:

SPONGE — (countable) Any of various marine invertebrates of the phylum Porifera, that have a porous skeleton often of silica.

Definitions from Wiktionary.