i have been reading people using a plastic/vinyl cleaner for black carpets and floor mats,
i just pick up some einszett Plastic cleaner, read some good reviews on this with carpets actually
http://www.detailersdomain.com/1Z-ei...ner_p_106.html
that and a nice carpet brush
or you can go cheap and easy
[ame="https://www.youtube.com/watch?v=h-58f07cZGQ"]How to clean car carpets - The easy way - YouTube[/ame]