I was doing a but of Spring cleaning on my car and was able to use a Bissell SpotClean Pro machine (thanks Melville!) to shampoo the mats and interior carpet. I came across a stain which I could not remove so rather than blame Melville for buying a defective product, I marked it up to a careless PO who did not clean up after themselves.
BTW, the Bissell SpotClean Pro is awesome! I liken it to the first time I used a Dyson after using a traditional vacuum. The amount of dirt hiding in the floor mats and carpet was astounding.