Has anyone used Tempest Cleaner on a copper roof?

I am quoting a job that has a large section of 9' high copper lined roof, the area above is concrete type with black algae staining. I'm wondering if the runoff from the Tempest cleaner I use might stain the patina on the copper roof which has long since turned green? Any ideas from previous use? I'd upload a pic but the pic uploader seems to be taking so long the job will be over by the time it loads.

Thanks!!

Aaron

You can use Limoline from Envirospec. It doesnt patina the copper at all. We always use it if homes have copper gutters.

Never heard of tempest cleaner.