You'll get the rest of the muck out your drivers mat if you give a wetting with any old APC and blast it with a pressure washer. hour or two hanging up to dry if you don't have an extractor .
All purpose cleaner. Judging from the photo I reckon it will make it look better. Slow sweeping passes you will actually see the dirt flowing out. I'm sometimes amazed by just how much muck comes out of seemingly clean mats.