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.
Sinkhole Causes. The dissolving (or solutioning) of carbonate bedrock occurs over thousands of years. As the limestone dissolves, soil erodes or âravelsâ into the open seams or caverns. The erosion progresses upward toward the surface until a surface collapse occurs.