Hi Wayne
We had one too eons ago!
Only ours the cooking plates were both reversible and removable. One side was flat with grooves, the other side was like a grill with very deep grooves and narrow tops where the meat rested.
We tossed ours into the dishwasher and never had a problem from that.
However, the designer of the item must have never cooked anything in his life, not even hamburgers. There was NO PLACE for grease to go at all, other than down into the grooves. From their it would run down into the coil area and be a potential fire hazard.
Since the plates were aluminum and the housing mainly plastic. I drilled a 1/4 inch hole in each plate near the front and notched out the plastic to hold an empty tuna can wedged under the plate and within the front lower handle which was also cut to accomodate this tuna can. It was insulated from the heating coils of course by the ceramic panel inside.
This at least made the thing usable for a short time, then the upper heating element burned out and a replacement could not be obtained, so we filed it in the circular file #13.
TTUL Gary