ProPlus Heavy Duty Grouting and Haze Buffer Sponge. Armaly ProPlus Grouting & Haze Buffer 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 faster. This product incorporates a layer of our 2520 BuffCell material on one side to assist in removing grout haze and dried grout from the surface of the tiled area prior to cure. The sponge is shaped with rounded edges.