Hi Mate,
I heated the bed up to about 90-100C and then peeled it off, whilst it was at that temp, WEAR GLOVES!
there was no real residue left and the using a scraper I cleaned any adhesive off, ,
I also brought it up to about 70C when I applied the new sticker
Thanks, Anthony. The FlashForge rep got back to me and recommended the same thing.

I use this stuff: http://www.amazon.com/gp/product/B00...=sr_1_4&sr=8-4

I cut it into 5 2" squares, one for each corner and one in the middle. You could cover the entire build plate which would give you more even heating, but I suspect that would be hard to remove. These pads don't have adhesive but they physical bond they have with flat materials like glass and the build plate is pretty strong.
Thanks, DJ. I went ahead and ordered a borosilicate plate and the pads you recommended. Unfortunately, it looks like I need to print a shim before I can install the plate, so I'll need to put on another printing surface first. Hopefully Anthony's (and FlashForge's) comments are right, so removal is easier next time. Also, this way I won't have a week's downtime while I wait for the part to arrive.