Stain on Corelle plate

Hi,

I have recently started using the dishwasher and I notice that my Corelle plates have black streaks. The stains are not very ugly but my white plates are not the perfect white now:-(

I wonder whether the streaks are from the friction caused by other vessels in the dishwasher. I tried scrubbing and washing the plate by hand but the streaks don't seem to go. Can I try magic eraser? or is there anything I can do to make my plates look white again. I use Cascade in the dishwasher.

Any thoughts please share.

Thanks in advance,
Leo