We removed the tiles from the floor. All that's left is the tile adhesive (see pictures). I can't get very far with a 7 cm wide chisel because the glue is very stubborn and won't come off. The glue is about 3-4 mm high and spreads over an area of 70 square meters. After that, 60 square meters of parquet and 8 square meters of tiles need to be glued.
What would you recommend?