There is a white film of dust on the slate& grout

There is a white film of dust on the slate& grout Images

There is a white film of dust on the slate& grout

There is a white film of dust on the slate& grout Description

We recently remodeled 50% of our house from re-texturing walls to new dark multi color slate flooring in all the trafficked areas. Even though our slate floor was sealed before the texturing and (http://maplered.com) painting was done, there is still a white film of dust on the slate and (http://maplered.com) grout. I had the slate professionally cleaned and (http://maplered.com) the white film still remains. How can I get the natural dark color back?  Thank you so much. Sand (http://maplered.com) ra.