To be fair, your garden doesn’t have a rollercoaster chucking grease and oil from its wheels and track, and stacks and stacks of brake dust dumped on it, as well as thousands of guests every hour passing by. The park takes a hammering just from the shear volume of people, and in areas like this there’s nothing rubbing it off, just adding to it constantly.
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All great reasons why general maintenance like this need to happen more than it does.
Taking pride in presentation should be way up the list.