Though porcelain itself doesn't rust, it can easily become the victim of rust stains if a rusty item gets too close. These stains can noticeably stand out and mar the appearance of your porcelain, making it less appealing to eat from. Rusty-looking porcelain isn't a sign that you need new dinnerware. With a minimal expenditure of effort on your part, your porcelain plates will quickly and almost effortlessly come clean.
Set the plate on a flat surface.
Pour white vinegar directly onto the stain so that it's covered with a small puddle. If the stain is on the edge and cannot be soaked this way, soak a cloth or sponge in white vinegar and set it on the stain.
Allow the area to soak for at least 10 minutes.
Wash the plate with warm, soapy water to rinse away the vinegar and rust.
Dry the plate with a soft towel.