What gets rust off porcelain?

[Yossarian]

I left a shaving cream can on the edge of my tub and now there are rust spots

 

[minendo]

Comet

 

[SociallyChallenged]

Many cleaners that you can buy from the store, for example the scrub free spray.

 

[Savij]

409 and a paper towel usually work for me.

 

[GalvanizedYankee]

CLR might work.

 

[DannyBoy]

Rust on porcelain?

 

[Staples]

CLR will probably do the trick.