I've got the brush today and have it tried the same. I have to a wise cloth zwichen hoses clamped and what I was after only 1 available minute mattresses eyes saw the towel !!! A gray dust and that's mite and dander! When I had both Matzratzen Pop groups of container was alarmingly full of gray dust!
I can only advise everyone to buy the brush can not sleep on the mud and dust to be healthy !!!