I am really disappointed. Have just completed a kitchen refit and bought a lovely shiny Zanussi ceramic hob.Have used it 5 times only with brand new pans and it's terribly scratched. Why? Can't figure out why it's getting ruined. I have cleaned it with ceramic cleaner and soft cloth, nothing abrasive and checked pans and they are fine. Is this usual for ceramic hobs in or am I doing something wrong?