Armaly Tile and Grout Hydrophillic Sponge, HDQ Polyester. Armaly ProPlus Grouting & Concrete Sponges are made with our HDQ Polyester sponge material. This time tested formula provides superior strength and a cell structure that wipes and rinses excess grout & concrete faster. The sponge is shaped with rounded edges that are designed to minimize digging out or scoring of grout lines…to meet the demands of the professional setter.