I am not sure when the insulation was blown into our 126 year old house, but it is a very nasty gray and more like dust bunnies than insulation. Our house is soooooooooo dusty and it seems to be "gray dust". I'm thinking the dust is from the insulation being pulled from the attic by our heating system. The house sat empty for 2 months before we bought it and there was NO dust. We moved in and the dust started to appear and has just gotten worse. I can dust in the morning and by afternoon everything is covered with a film of "gray dust". How do we replace that insulation and should we? Is there a way to vacuum it out? I'm afraid we would never get it all.