Perfect Dirt Trap - The WOLTERS Cleankeeper Runner. The WOLTERS Cleankeeper Runner is a true dirt trap. Thanks to numerous soft microfiber strands, the mat absorbs mud and water within seconds, which your dog brings into the house daily. It also dries significantly faster than traditional mats. A rubberized underside prevents unwanted slipping. Due to its length, the runner is especially suitable for hallways. The runner can be washed individually on a gentle cycle at 30 degrees and should be air-dried.