Thought i would start a new topic on this. Details: 40 ft copper wall/roof mansard surrounding elevator shaft at hotel in Beverly Hills. On site maint. guys keep the easy to reach areas clean but they need us for the high reach areas. Facility manager says he does not need it to be like a shiny copper penny but would like it to match the areas they cleaned. No issues on access. Just need some advice/tips on best way to clean this.  The close up photo is the goal to match and as you can see the appearance is what I would call an aged/modeled copper (no patina) look. Any help would be appreciated!