In the attached photo what should be done if anything about the copper awning above the windows. Will my Mix of 1 to 3% having any bad effects on the copper. This is drivet on the house.
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Keeping them wet and diluting any runoff as it hits has always worked for us. This is all we’ve ever done even with a roof strength mix and the results have been good. Might clean them slightly, but doesn’t seem to affect the patina too much. We just let the customer know that they may clean slightly. Water, water and then water some more. 
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Agreed Jason.
It takes an acid to effect a change on copper. Properly diluted house wash mix on a pre-wet copper piece should have no ill effect.
Looks like a house I washed last year.
Pre wet and rinse after and you’ll be good
