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The grass on the sides can be dug up in squares, 6" dirt dug out, and then the grass replaced.
That might help with drainage and keeping staining dirt from washing onto it all the time.
You might be able to widen it and put pea gravel or colored stones on the sides (?)
No hard grout means power-washing will tear it up if not careful and patient.
Spray some wet-n-forget, and a week or two later some kind of soap on wet days which can marinade, and then use the lightest wand nozzle.
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Meanwhile other things are still happening.
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