Try curling your fingers under, pinch the bronze wool between your thumb and curled index finger and then put the bronze wool to the glass. Now you can let your thumb and fingers rest as you apply pressure to the wool with your arm. The curled fingers create ridges of pressure on the glass. As I am right handed, I generally try to do most of the scrubbing with my left hand.
These are pictures of the Unger Clamp with bronze wool pads in them. Pictures 2 and 3 has the pad folded so it goes across the top of the clamp...this creates a nice flat surface, with hard edges to help get in the corners if need be.
These are pictures of a drywall sanding pad, I think that's what they are, with 0000 White pads in them. I've had them for years...haven't used them much because they can be a knuckle buster. But, they are better then nothing when your tired. Herman Wieland (He Man) has an idea, that if modified a little, would be great for a bronze wool pad.
Hope this was of help. Sorry for any writing error...have to write a proposal for early morning.