The laundry detergent is great in that it has brighteners in it which will help, however, for truly filthy carpets, you can escalate with Simple Green used in various concentrations and for really bad cases, add TSP to the detergent. For carpets that can't be removed from the car and for seats, nothing beats a strong wet-dry vacuum and lots of water following the soap and scrubbing. I've encountered seats that have been soaked with stuff like orange juice and had them come truly clean by putting in and sucking out about 15 gallons of water. Be sure to throughly dry everything with sun and fans or it will smell of mold. If mold is the basic problem, vinegar in the rinse water will kill it without bleaching the carpet.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles