Transmission additive magic

From : ignoramus18786

Q: just had about 960sq.feet of tile installed. now comes the clean up. what i have to remove is the dust like film that is left behind after the grout. the tile is porcliain if it matters.also the grout is hard and ready for sealing. messed around with a sponge and a couple of buckets of water theres gotta be a quicker way. any thoughts on how to shorten what looks to be a real long job. roy .