Rust Spots, Yellowing:
There is no metal content in Corelle, so any brown/orange rust spots that appear on the dishes is always caused by contact with something else that is rusty. Most commonly, rust on the edges is caused by contact with rusty dishwasher racks. The spots often can be removed with the appropriate cleanser*, but if an item has edge wear as well as edge rust, the marks might be permanent because the porous worn edge will not give up stains easily.
Water with a high iron content can produce an all-over yellow or orange build-up after years of washing. Usually this can be removed successfully with the appropriate cleanser*.
You can remove nearly all rust spots on Corelle dishes with a moistened nylon or plastic cleaning pad and a non-abrasive cleaner. Corelle sells a liquid conditioning gel intended for removing rust spots and metal scratches from silverware, although other liquids and powders are available that can provide the same results. Test the cleanser on a small, inconspicuous area of a dish before applying it to the entire piece.
Natural ways of cleaning rust spots from Corelle dishes include sprinkling baking soda on the rust and using a moistened nylon or plastic pad to create a paste. Let the spot set for 30 minutes before rinsing it off.
aDon't use metal scouring pads or abrasive cleaners to remove rust spots on Corelle dishes; doing so will likely scratch the finish of the glaze and damage the integrity of the dish, inviting future breakage. Plate and bowl edges can become rough and porous over time because of hard water in the dishwasher. If rust appears on a rough edge, it will be extremely difficult to remove and may not come off at all.
Read more: Why Are There Rust Spots on My Corelle Dishes From the Dishwasher? | eHow.com http://www.ehow.com/info_10003532_there-rust-spots-corelle-dishes-dishwasher.html#ixzz28Wb8CvsP
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