[oldeguy]

Any of the chemical carpet cleaners should be able to do the job. Spray it on, use a small scrub brush, and it should come out. If that doesn't get it all, go rent a carpet machine from the Grocery store, with an upholstery attachment, spray a spot remover on it, then brush it a bit, and then use the machine to clean the mat and carpet. It should be enough. If it isn't, you could try spraying Windex on it, let it soak for a bit then continue with the machine. Then, spray Teflon on the carpets. I'm not an Auto Detailer, but, part of my employment involves cleaning carpets.