If I am not mistaken it's a very old Orsi, Italy stencil. 1950's, before they switched to sheet guards.

Honestly....what this horn needs is a professional chem bath or sonic bath cleaning from a tech's shop.
If you disassemble and remove all pads, they probably will only charge you around $50 for the bath and rinse.
You can then bring it home and hit it with a hand-applied paste polish....Maas, Wenol, Flitz. Don't use Noxon or Brasso, as those may disintegrate what's left of the lacquer.

Home remedies aren't gonna get you too far, really. If you insist on that route, again it's gonna be a wet-cleaner (IOW all keys off, all pads out). Barkeeper's Friend or Wrights Copper Cream are your best sorta hardware-store available options, if you can find either. If the Barkeeper's is a powder/cleanser form, mix it with water into a paste before applying.

Just using any sort of hand-applied, buff/rub-off polish....will not get that most of that stuff off, even with repeated applications.

 

My local tech does have an ultrasonic cleaner. I'm sure he'd throw it in there for me.
Is this the red rot?

 

Yup Red Rot.

Good, the ultrasonic bath will do a good job, it will get it to a spot where you can hit it with the Maas, Wenol, Flitz and in the end it'll look a hecka lot better.

Not bad horns, they sound beautiful. They do blow with a little bit of resistance, the Orsis, as compared to other horns of the era. Ergos are acceptable.

 

Sounds like a plan!
I already asked the tech about fixing the neck, he said it would be about $50 but he is pretty swamped with back to school work now.

This was recommended in another thread as another polish option COLLINITE LIQUID METAL WAX

 

Sounds like a plan!
I already asked the tech about fixing the neck, he said it would be about $50 but he is pretty swamped with back to school work now.

This was recommended in another thread as another polish option COLLINITE LIQUID METAL WAX

Never heard of it, but Caswell sells good stuff...maybe worth a punt. The thing is, the sonic bath likely will not remove all of the red, but will make some it 'more easily removable' - which is why hitting it with a polish will likely be necessary.

 

I have exact same horn. Richmond on bell. Same g# touch, same bell key guards

 

I have exact same horn. Richmond on bell. Same g# touch, same bell key guards

Nice! How do you like it?

 

This seems like the perfect project horn for me. Good enough to be worth doing, but not too valuable.

I have a home business repairing old audio gear so this isn't too far outside my skillset. And I played around changing pads on an old junker horn back in high school and did okay. (though that horn might have been a bit too much of a junker.)

I've finished tearing it down and am measuring pads right now. Wednesday I'll take it in for cleaning.

 

Ultrasonic done! He didn't even charge me. I have a good relation with the tech. He contracts electronics repair out to me on occasion. And he's done lots of work for me in the past. No one else will touch my horns.

He's not too concerned with the rest of the now pink discolouration but I'll give it a good polish.

When it is done I'll take it all back to him to get the neck straightened out.