Hello all - I'm in search of wisdom. DH has burned something into our new expensive iron - one of the ones with a huge water reservoir and I can't get it off. Have tried scrubbing/vinegar/salt as suggested online but it won't bloody well budge. I don't want to keep scrubbing in case I take the surface off the plate. Any bright ideas? (Have told DH he needs to sort it but that's unlikely to happen any time soon and I need it functioning)