We have just bought our first house, we move in in two weeks time. The owner told us the old textured ceiling had been removed a month or so ago (house is empty owner lives in another city) new carpet was put in before this was done, the removal was done by a painter, I called the painter just to confirm how he did it all, he said he placed plastic on the floor taped it to the walls, wet the ceiling before scraping it off. I just had a look through the window of the house today and every room that the popcorn was removed from is this white powder on the window sills, would this just be plaster or could it be part of the textured roof? Im sure I could faintly see something sparkly in the powder. Should I be worried about this?