Your concrete goes through a lot. It takes a beating every winter from rain, snow, dirt, car traffic, foot traffic and freezing temperatures. After winter and relentless rain and moisture, the Spring sun comes out and feeds all the little moss and weed spores and creates growth. As you can see in the photo, not only is there moss growing from the concrete cracks, the concrete is black. This is mildew and will get darker and darker every year it is left without cleaning. All of this can cause damage to the concrete and create cracks. Cracks give moss and weeds a perfect environment to thrive. Get a yearly preventative cleaning to keep the moss and weeds out of the cracks and keep the concrete looking bright and brand new. We clean concrete with high volume surface cleaners and a anti-moss treatment similar to 30 second cleaner.