How to get rid of rust marks?

try these ways, hope they help !

1.Salt + Lime: put little bit of salt on the rust, then squeeze the lime over the salt until it is soaking. let it for 2-3 hours.

or

2. White Vinegar + Aluminum Foil: wet the aluminium foil with white vinegar and scrub on the rust.

or

3. Baking Soda + Water: put baking soda directly into the rust and use a tooth brush and scrub on the rust.

From the seemingly bizarre advice for toilets, yet with porcelain that has a culinary purpose in mind - perhaps try Coca-Cola, a paper towel could be liberally dowsed and hung over the area if it's the edge.

You should be able to try this continually until success.

Thing is, rust is comprised of very fine particles - I liken it to barnacles finding a way to anchor themselves even on Teflon....

Go to the market and get CLR. Follow directions. Rinse bowl real well before using. Get a better whisk they should not be rusting. Throw it out.

Use some baking soda and lemon juice.

Try bar keepers friend:

http://www.barkeepersfriend.com/porcelain