What kind of eraser is best when altering a sketch drawn on canvas?

I have been sketching a picture on canvas and used an eraser a few times when I needed to make alterations. I'm having difficulty getting rid of the little bits of rubber which want to cling to the canvas. I've tried my hand, my sleeve and one of my paint brushes and still there are small pieces which... show more I have been sketching a picture on canvas and used an eraser a few times when I needed to make alterations. I'm having difficulty getting rid of the little bits of rubber which want to cling to the canvas. I've tried my hand, my sleeve and one of my paint brushes and still there are small pieces which cling to the canvas. I will have to use a stiffer brush now but I'm wondering about next time. Are there different erasers for this purpose or does everyone have this problem?
Update: Puppy Zwolle (or anyone else who knows) - what do you mean by a wing?
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