Answer
How do I maintain a block paving driveway?
Sweep, keep the joints sanded, manage weeds and wash it; relay any sunken blocks.
In short
Sweep it, keep the joints sanded, deal with weeds in the joints, and wash it occasionally; any sunken or loose blocks can be lifted and relaid. Block paving is repairable block by block, which is one of its advantages, but the jointing sand and the edge restraints are what keep it tidy.
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