If your concrete driveway’s looking grubby, it’s best to try cleaning it with water and a brush, or a mild detergent. However, if this doesn’t work, it can be worth trying bleach.
Dilute your bleach down to 50% bleach and 50% water, and apply it to your driveway. Leave it for 10 minutes, then scrub it using gloves and a stiff brush. Finish by rinsing your driveway off with clean water.
It’s important to remember that bleach can stain certain surfaces and kill plants. So, if you’re concerned about materials and boarders around your driveway, it might be best to use a different type of detergent, like floor cleaner or degreaser.