After grouting about 75 sqft of a 225 sqft quarry tile room we noticed some pretty bad grout haze. I've since learned that with quarry tile it's recommended to seal the tile prior to grouting to help in the clean up and that quarry tile is particularly difficult to clean of grout haze. However, "difficult" doesn't seem to capture the problem. To remove it, so far we've tried:
- Tile Doctor™ Grout Haze Remover
- Fila™ Cemetitious Grout Haze Remover - Product recommends a dilution of 5/1. We started there, then tried 2/1, and finally undiluted
- Vinegar diluted in water
- Straight vinegar
- Muriatic acid (20% concentration) in 4/1, 2/1, 1/1 dilutions, and straight from the bottle
In all cases, we also vigorously scrubbed with a stiff brush. None of the above have made any noticeable difference. What else can we try? I'm starting to feel that we might have to rip up the hazed tiles. Here's a shot that shows the hazed tiles next to clean ones.