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It's likely a combination of all the same stuff that turns my driveway here in Orlando the exact same color on a regular basis. You don't have to drive rubber tires on it to get that, the normal rain and weather will produce the same blackening of concrete. The rain and humidity in this climate is absolutely brutal on anything that is left out in it. It's the reason I have to pressure wash my driveway, the sidewalks, the front walks, the pool deck etc (all concrete) at least twice a year to keep them clean.They have occasionally pressure washed segments of the beams, especially the loop that runs through Epcot, etc.. However the mechanical process of doing that is incredibly cumbersome ( takes the longest garden hose you've ever seen) and difficult and takes a long, long time so it's not unreasonable for them to get behind on it. When you combine that with the new OSHA regulations they have to comply with, you can't just have someone hanging off the beam with a pressure washer to clean it. it doesn't do any real harm to the concrete which is why they have typically only cleaned those areas near stations and within the parks.
It's likely a combination of all the same stuff that turns my driveway here in Orlando the exact same color on a regular basis. You don't have to drive rubber tires on it to get that, the normal rain and weather will produce the same blackening of concrete. The rain and humidity in this climate is absolutely brutal on anything that is left out in it. It's the reason I have to pressure wash my driveway, the sidewalks, the front walks, the pool deck etc (all concrete) at least twice a year to keep them clean.
They have occasionally pressure washed segments of the beams, especially the loop that runs through Epcot, etc.. However the mechanical process of doing that is incredibly cumbersome ( takes the longest garden hose you've ever seen) and difficult and takes a long, long time so it's not unreasonable for them to get behind on it. When you combine that with the new OSHA regulations they have to comply with, you can't just have someone hanging off the beam with a pressure washer to clean it. it doesn't do any real harm to the concrete which is why they have typically only cleaned those areas near stations and within the parks.