Is this grout haze or not? - At my wit's end.
Pictured is my 12 x 24" matte finish porcelain bathroom floor tile with 1/16 inch portland cement pearl grout. I cannot seem to get rid of the grit near the grout joints. Tried vinegar/water, straight vinegar, drywall sanding sponge, Scotchbrite pads, Magic Eraser, etc. to no avail. Is this grout haze? I can feel the difference in texture when I run my finger across the tiles. It gets very gritty and rough as I approach the grout joint. All suggestions welcome!