From what I can see brass wool is a very little bit softer than glass and steel wool. There are three sized pads. The finest is equal to 00 steel wool. It has a 50 micron average fiber width. 0000 steel wool has an average fiber width of 20 microns. It has been used along with WFPs to convert hydrophobic glass to hydrophylic. While cleaning! As I can see this is not a magic trick. But rather all that we are doing is removing all hydrophobic pollution from the glass. Because ALL glass is hydrophylic by nature. Not hydrophobic. Once it is completely cleaned of all pollution it becomes hydrophylic. My thoughts are that particles which have the right angular shape/cut and are at least 20 microns or smaller, would do a better job at cleaning the glass and returning it to its true hydrophylic nature much faster. Then if we could make a pad based on this technology we could put that on a WFP. Cuz the real magic will be revealed when we have developed a product that can quickly and most effectively convert hydrophobic glass to hydrophylic AS WE CLEAN. Also using nothing but pure water. No chems either. For a perfect clean and rinse.