Whats a good way to Clean the Interior?

My interior in my car looks like crap, with such a nice body on it , i hate to spoil the look with aDirty interior, My Interior is black/tan you can sorta get the color there. . but the carpet, seats are all the tan, and get dirty and have been dirty for a long time. Since i bought it the interior is basically black, the seats, carpet, etc. What are some good things to use to clean it? i tried a rug shampooa, but i think i also need something to really get down into the cracks in teh seats, and to liquify the Coke, etc.