I never had luck with a glass bed. My new printer has a magnetic spring steel one with a rough texture. Stuff sticks really well. To remove just pop of the plate and flex.Just wanted to say that I have given up on the glass bed. I have returned to the standard one with a piece of paper under it in the centre. It is flat across the whole plate.
The glass one failed adhesion unless run at 70°C so it has been consigned to the 'learning' bin.