On Mon, 28 Jan 2019 12:42:20 -0500, wrote:

I bought a house with a nice outdoor, flat stone tiled walk way.
Unfortunately the tiler/installer was "quite sloppy" in a few areas.
There many of the tiles now have a thin, but annoyingly Noticeble
coating "film" of concrete grout on the top.

I have tried coarse steel wool, with limited (slow) improvement. Is
there a better/ recommended way, to remove that concrete film? I
would really like all tiles to be fully visible, no film.

PS I am NOW aware that I Inadvertently, first posted this question to
another board I follow -electronic repair. Surely my oops

A few ways:

Grout saw is one
https://mobileimages.lowes.com/product/converted/084389/084389027384.jpg

Tile Lab Sulfamic Acid tile and grout cleaner (follow directions
closely)

https://www.custombuildingproducts.com/products/care-maintenance/cleaners/tilelab/tilelab-sulfamic-acid-cleaner.aspx