Cleaning Mossy Driveway

Use a power washer.

Please don't use bleach, not eco friendly and it will harm your new concrete. As a plumber who deals with contractors constantly that's bad advise.
Good advise, natural,eco friendly, natural mold killer, no allergy problems. Borax its cheap and a natural effective Mold killer. you will love it you can use it everywhere and you will not damage your nice new concrete! You can buy it almost everywhere and it is under $5.00 a box.You can also use it for objectional smells and laundry.

Bleach will kill moss,good luck.