How can we repair weathered bamboo wind chimes?

We recently moved into a house we are renting, and the previous owners left TONS of garden statues, tools, and miscellaneous decorations in the backyard. We threw most of the stuff away, but my husband wants to keep the bamboo wind chimes we found. They have been hanging in the sun for a very long time and are quite weathered. The wood is very dry, and one piece of bamboo is actually split. Is there a way to clean and oil it or something to make it look nicer without disrupting the sound it makes? A stain, maybe, to protect it from more damage? I have moved them to a shadier spot, but would love to make them look nicer if possible. Thank you!!! =)