First of all, if there are no rusted parts, try with a ballpoint eraser. Is an easy way to clean the frame.

Before... after:
[Linked Image from i.ibb.co]
[Linked Image from i.ibb.co]
[Linked Image from i.ibb.co]

Before... after:
[Linked Image from i.ibb.co]
[Linked Image from i.ibb.co]

Without chemical treatment. If there is more dirt, other methods will have to be tried.

Regards!


28 ga, hammerguns and all shotguns and rifles made by hands.
Waidmannsheil 🌿📯