What items should never be placed in the Rengora dishwasher?
Do not put items made of wood, horn, aluminium, pewter, or copper in the dishwasher. Items that can absorb water, such as sponges and household cloths, should also never be placed in the appliance. Only use the appliance to wash items that are dishwasher-safe. (Page 13)
From the official Ikea 804 756 07 Rengora Integrated Dishwasher manual, page 13
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