That's because it’s not asphalt. If exposed to weather, over time concrete areas will always end up covered in stains or mildew that is not only dangerous to health and safety but also very ugly to look at. There are professionals that make money out of cleaning concrete and within a few months the black will be back! Asphalt on the other hand never needs cleaning. Maintenance is usually just simple repairs to odd cracks and the occasional pothole, carried out with a minimum of fuss and bother. You don't need to paint it, seal it or pressure wash it. Asphalt will stay looking great for many years.
14 Apr 2016