I wouldn't know how to get it out there except for shaking the device
But at least the 600 looks easier to disassemble than the 505 where the housing is a single aluminum profile. The 600 looks as if you can remove the backplate.
The service manual says "case upper assy (including touch screen)", so I assume disassembling the unit from the backplate will bring you to the point where you'll get to the space between eInk and touch layer. I think you'll have to be extremely careful though if you open the device so that you don't get dust and additional crumbs into the unit by trying to get rid of the one crumb you allready have.