a friend and I saw a viedo on horns getting dry and not sounding good. the guy said on his ranch in Texas they put there horns into a bucket of motor oil for a few days,then take them out and wash real good with soap and water,makes them sound like new.
My friend did it and his perked up and sounded good.

mine I always put them into the closet untill the next year,they are about 10 years old and still sound good.( rattled in 5 good deer last year.)

I am not a hunter I am a whitetail population reduction specialest

remember keep your back to the sun, your knife sharp, and your powder dry.