Start by grabbing a flashlight and turning off the lights in your kitchen. Shine the flashlight in the bottom of the dishwasher. Any pieces of glass will catch the light so you can see where they are. Then take 1/2 of a raw potato, and while wearing thick gloves, run the potato over the glass shards. The glass will become embedded in the potato and be easy to remove. It's also great if you've got glass shards stuck in the garbage disposal, or anywhere else your vacuum doesn't really do the trick.
source : http://simplystated.realsimple.com/2012/08/22/remove-broken-glass-dishwasher/
