[sherco]

This is part of a 400sqm limestone floor in a church refurb. Floor was rejected on handover due to light scratches and being dirty. They called in a guy into clean & hone the floor!! This is what they ended up with before they stopped him. They tried to remove the sealer but couldn't, so I went and did a test area with Aquamix sealer & coating remover with a bit of honing powder. They were pleased with result on test area.

[B Bailey]

Had to re-read your post, after looking at pics.
That will be a nice little earner for you, and good one for website.
Been to quite a few limestone jobs where previous cleaners were kicked off cos they can't do the job. I think they assume you can clean the same as vynil.