This is a bit of a complicated issue so:
1) Simple version is my fence installer decided to use an angle grinder to grind 2 fence panels on my 1.5 week old driveway (with no covering/protection) like thus: (I can't zoom in any closer otherwise the resolution would be too low).
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Post, it looked like this:
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After a wash with the garden hose and brushing, it looked like this (note, it's still a bit wet after drying for a period of time):
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