Tips & Warnings. 1  If you are cleaning an indoor concrete slab, wet it down thoroughly with a mop and plain water, then scrub with scrub brush. 2  Mix up an all-purpose cleaning solution, scrub the concrete, then rinse with a mop and clean water.
How to Repair Potholes in Dirt and Gravel Driveways - How to . Most potholes in dirt or gravel driveways are caused by water trapped below the surface, so be sure to maintain or improve the quality of underground drainage.
Consider the caves you may have visited. The cave networks are the underlying cause of surface sinkholes. When the roof of the cave collapses, or where cracks and fissures in the rock allow overlying soil to erode into the cave, the void can eventually reach the surface.