Hi Tesea,
If the breadbin has been rubbing against the tiles over a period of time,then maybe the glaze is marked beyond repair.Apart from trying the usual type of cleaners,I can't think of any other way.Don't try anything abrasive.If it looks that bad,you could always replace the affected tiles,but I dont know much it bothers you. I would certainly move the breadbin.
Thanks Roughcaster....The advice I recieved that worked was....
Toothpaste + Bicarbonate of soda.. Mix equal ammounts and apply with wet cloth.. It took a lot of elbow grease but it did remove mark...
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