Rust spots on irons | Golf Monthly

In the middle of the face perhaps?

As for the OP's question...Coke does indeed work pretty well, primariy for 'spots', but I've use it to remove surface rust on a Carbon putter that I had thought was 'stainless'! Once 'treated' then the likes of WD40 is needed to keep water (therefore more rust) away.

Dremel action is rather unsubtle! It can remove rust, but also quite a bit more!!