OEM horns were working properly (when hardwired to the battery at least) but looking ugly. Greenish/moldy kind of ugly. So one of those days with nothing interesting to work on the car, I decided to give them a good clean an paint. Only external work, I didn't pop them open.
After some wire wheel:
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And after some paint:
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Now the fun part... They are sounding like crap now they are cleaned and painted LOL. Not sure what the external paint coat could have done wrong LOL.