Welcome to the Bunnings Workshop community @Former Workshop member. Many thanks for your question, I'd be glad to answer it for you.
I have made contact with Dunlop to discuss the possibility of removing it altogether or if there are other solutions available.
They have responded that if the product has penetrated into the tile or stone it will be hard to remove. The use of Xylene can break down the sealer but if the tiles are extremely porous this will only effect the top layer.
If you were to attempt this they recommend trialling the Xylene in a corner as a test patch and once dried, do a comparison against a sealed area for water penetration.
If you need any further information or have questions, please, let me know.