If you have or have access to a pressure washer that would be the fastest and easiest way to clean them.
For staining, I don't know how well a stain would work, but if you do find something just make sure to put a coat or 2of sealer on it to keep it from washing off and fading quickly
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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I put down a new door mat and 4 days later found a brown stain where the mat was on our front stoop. I tried detergent and a soft brush but it is not working. The mat...
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A pressure washer would be great or if you don't have one a strong bristle brush would work.
If you have or have access to a pressure washer that would be the fastest and easiest way to clean them.
For staining, I don't know how well a stain would work, but if you do find something just make sure to put a coat or 2of sealer on it to keep it from washing off and fading quickly