I've had this grill for a year now and use it all the time. Just recently it has gotten extremely hard to get the plates clean... I've tried soaking and scrubbing it. I don't want to use anything abrasive on it but I can't figure out an easier way to clean it. :( we used to have the regular Foreman without removable plates And that was hard to clean so we switched to this and it was so easy until recently. Is there a way to get replacement plates?