Hi stevie,
Like shaney says the ceramic hob scrapers are really good.
Ours came with the Neff hob, Schott Cera Quick - googled them but all in German!
You could try Neff spares 08705 543210 (I ordered extra blades as the ordinary razor blades don't fit). Or their product advice line 08702 400080. The cera quick is specially made for glass.
It has proved invaluable for various tasks around the home, (I think it is the best gadget I have), great for removing sticky labels, paint, burnt on oven grease - the list is endless.
Don't be tempted to buy a cheapie plastic one with a blunt razor - because they do sell them.
Hope this helps you - if not let me know and I'll send one on to you...
love
n00dles ☺