Brush jasco on the grout and scrub with wire brushes is another option. 

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On Sep 24, 2018, at 8:11 AM, csantospago@gmail.com wrote:

This sandstone is like a sponge. I can color seal sand stone?

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On Sep 24, 2018, at 10:55 AM, Fred Hueston <fhueston@gmail.com> wrote:

I would color seal them or regrout

On Mon, Sep 24, 2018 at 10:55 AM <csantospago@gmail.com> wrote:
Hi Pros,

Have this sandstone floor with sanded grout that was waxed before. We stripped and grinded and polished the floor but the grout lines are tough (pic below)
Anybody have any good ideas?
Thank you,
Chris Santospago
Restoration by design stone

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Frederick M. Hueston
www.stoneforensics.com
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