Any tips on removing tree sap from a metal roof?

[Todd's keyboard]

The Internet has lots of suggestions for removing tree sap from cars (hand sanitizer or rubbing alcohol).

Any ideas on a product that can added to a pressure washer to get tree sap off of a metal roof? I’m hoping something like a natural orange, citrus cleaner can be added to the pressure-hose mixture to spray on, degrease, and spray off in one go.

Thanks, Todd’s sticky keyboard