You can pressure wash to remove debris from the surface, perhaps adding a cleaner like Krud Kutter. Once you have it clean, consider using wet & forget outdoor to inhibit the growth of mold in the future.
You can use a wire brush for stubborn areas, just be sure to watch it on the mortar joints so they don't get compromised from scrubbing.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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Pressure wash on a low setting so that you don't disturb the mortar. Add a cleaner like Krud Kutter if needed.
Pressure washer and Wet and Forge cleaner.
You can pressure wash to remove debris from the surface, perhaps adding a cleaner like Krud Kutter. Once you have it clean, consider using wet & forget outdoor to inhibit the growth of mold in the future.
You can use a wire brush for stubborn areas, just be sure to watch it on the mortar joints so they don't get compromised from scrubbing.