I use well oiled steel or bronze wool on an oiled surface, and don't be too aggressive with the rubbing. It's easy to overdo, and also to do unevenly.
You want to reduce the overall amount of red oxide rust and especially where it's concentrated and will lead to pitting. Keeping it properly oiled with a preserving oil and correct storage will keep it preserved after that.
Take the grips carefully off before you start any of this.
The Erfurt's appearance will eventually grow on you and it's character will become attractive. Just stop any active oxidation. Like Don says, it looks like a 105 year old should look.
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
|