Hydrogen peroxide works well for me. It is very effective and cheap if you get it in the right place. I sometimes use alcohol and it works just as well. Another product is formalin.
use what you have. If you have hydrogen peroxide, I would go with that.
I would disinfect first and then put some ointment on it. A saddle or saddle type thing will help keep it clean after that. Keep us posted.
Cheers,
Sam