These felt seals are very poor in sealing anything. If you still have this system, never blast water at the axle when cleaning the motorcycle.
For more information on these seals and far more about wheel bearings, go to my article on wheel bearings and about 1/2 way down the page is the care of these seals.
Front page
Back of page. Don’t feel bad if you have trouble making sense of these two drawings. I like to think that I know what I am doing and I had to spend time figuring it out.