Does anyone know an effective way to remove the moss / algae from my tarmac driveway??
The pressure washer is usually pretty effective at removing the moss and/or algae. After washing the entire area with it, apply a liberal amount of ordinary laundry bleach. This will kill the remaining growth, but expect it to come back in the future, especially when the weather warms. There are commercially available products that do the same job but can be expensive and may kill the lawn that edges the drive… Good luck!