1070 Hydra Scrubbing Sponge by Hydra Hydra Scrubbing Sponge 6-5/8″ x 4-1/4″ x 2-1/4″. A Hydra tile grout sponge on one side and a scrubbing sponge on the other. Wipe off tile grout or remove grout haze. . Posted in Hand Sponges, More Tile & Stone Tools, Tile & Stone Tools tagged with Hydra