I have "dirty" lidar data containing first and last returns and also errors under and over the surface level. (Screenshot)

What would be a good workflow to clean this data? Is there a full automated method or would I somehow be deleting manually?
I have "dirty" lidar data containing first and last returns and also errors under and over the surface level. (Screenshot)

What would be a good workflow to clean this data? Is there a full automated method or would I somehow be deleting manually?
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