How do I clean a copper roof?

We have a copper roof on top of the bay window on our house, and I want to restore it to it’s original lustre. Does anyone know of a product I can use? Also, once I do clean it I’ll need to seal it against weathering again.

I’ve checked Google and the yellow pages, gone to Home Depot and Lowe’s, etc. No dice. The only copper cleaner I can find comes in small bottles. How far does that stuff go? I don’t think it’s intended for cleaning a roof.

Anybody know?

The Copper Oxide build-up actually protects the copper roof. It is not normally recommended to remove the Copper Oxide.
This might help a little, best source I could find for a cite:

If you still want to clean it, read this article.

Jim {My bolding above} looks to have about everything you could want to know about copper.
From a search of that site: Rehabilitation of Copper

Dig some more, that quote was the first likely hit I saw in a site search for ‘cleaning roofs’.

Once you’ve got it clean, there are several products like this you can use to protect the shine.

Thanks for the quick replies! (Rolls up sleeves)