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I have posted before about the wear in the valves on my Alex euph, and didn't mention what may have been the cause: corrosion. The first two valves were green when I got the horn, and there still is green corrosion in the tubing adjacent to those valves. I snaked the horn out real well, and squirted a bunch of oil, but the corrosion is as active as ever. How do I stop it? Years ago when I was a power plant chemist, we used to run an ammonia solution through the copper tubing to clean out corrosion, but I have no access to ammonia.

-Dave

it might be your personal chemestry plus the petrolium based vavle oil, try useing a non-pertolium based vavle oil, like zaja oil, u can order it from thier website

The gunk is only in this horn, and it was there when I bought the horn. The horns I use daily don't have this problem.

-Dave

I bought some radiator cleaning solution. Its oxalic acid based. I'm sure it will work fine, radiators are soldered brass.

-Dave