Hi partners,

I'm working on a porcelain tile floor restoration. Had to remove a heavy layer of mastic from this hexagon porcelain tile floor at Harvard University. They have covered this floor with carpet for over 50 years.
I managed to get 95% of it off but still have residual here and there.
I have tried several different mastic remover's and they all work OK but looking for something to remove all of it without damaging the tile.
The last resort is hands and knees and razor blades. Here are some pictures.
Thanks , Chris

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