Is that a no?
Once of my customers brought it out to show me. She sprayed it on some really bad grout lines and used a little over the counter scrubber and it looked like new.
Since I OP... I don't clean any tile. I sub it all out.
But if this stuff works on a larger scale with just some scrubbing, it could be worth it....If it's that good.
John G uses OP to clean tile.....and he seems to do an awesome job with it.