I use both on and off the glass methods, both work fine.I still can't understand why brush manufacturers site the jets in the middle of the brush.I jet my own brushes, and put the jets in one row of bristles down from the top. The top row of bristles stop the water from going over the top of the brush and into the vents.When I rinse with the brush on, there is far less chance of any dirt being left, there is only one row of bristles that could possibly contaminate the glass, all the rest are below the jets. Does this make sense to you. Dai