Are there any safe products, or home-made concoctions, to spray on the floor of the run to keep the dust down? My pen is four inches of construction sand. However, under it is clay soil and decomposed sandstone. This material works its way up through the sand and, combined with the feather dander, creates a very dusty condition when it's stirred up. Beyond hosing it down with water, are there any other non-toxic remedies?