How can I clean up stubborn portland cement grout haze?
Try using a neutral pH detergent and water with a scrub pad first. Conduct a test area to verify results. Use caution when scrubbing soft glaze ceramic tiles and polished natural stones. If the haze is persistent, you may have to try a more aggressive cleaner (e.g. The Miracle Company – GCFR 800 – 350-1901 , Aqua Mix Heavy Duty Tile & Grout Cleaner 800 – 266 – 6877, Dominion Restoration – Cera Haze 800 – 835-4456, etc. ) Follow the directions from the manufacturer, including dilution percentage and neutralization information. Rinse the cleaner with clean water after use.
