This is very good incense to use; I would recommend for someone else in need of it. Here is my experience with sulfur powder:
Although I did not use sulfur powder to smoke the room as an incense, I used it, however, to sprinkle on my shoes, and works very nicely in destroying astral parasites.
In regards of washing clothing:
Whatever you do, do not mix sulfur-laden socks with your laundry when washing them, or your clothing will smell like sulfur. Only dilation of the sulfur by water would remove most of the smell of sulfur. In my experience, I would recommend handwashing sulfur-laden socks with mild detergent and cold water.