This article is more than 9 years old. Concrete is the most widely used building material in the world, but despite its association with the modern city, it has been used throughout history.

You no doubt have done some barbecue grilling on your patio, so there is likely some grease and oil on the concrete. It is extremely important to clean this off along with other ordinary dirt. A ...

During his conversation with the rep, the subject turned to concrete. Kevin noticed that Duckback also produces a concrete stain. Having a gray patio of his own, his interest was piqued.