What's the best way to clean up broken glass?

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Recently there was a bad storm where my sister-in-law lives and it blew over her patio table umbrella, taking the table with it. Needless to say the glass table top completely shattered in a million pieces. They picked up several large pieces but there are still small ones stuck in between the floor boards of the deck and in the grass below. Anyone have suggestions as to how to best clean up the remaining pieces? Thanks in advance!