I'd start with a plain old vacuum, maybe rent one of the Rug Doctor thingies they have at the grocery store? Or use Prestone interior cleaner, available at walmart/autozone/those places, comes in a can with a bright yellow cap.
I have shampoo'd the carpets in several cars and do it alot in cars I detail one time for people. For me it usually involves using a portable carpet cleaner/ Steamer. It heats up whatever dirt or stains are heavy in the carpet and basically is like a steam clean, I just use a scrub brush before I vac the water/cleaner combo up to get stubborn spots and have a "magic carpet cleaning mix" for tought spots like coffee that sometimes require more than just heat and water.
I have seen car washes with the "warm foam" interior carpet shampoo'r(S) which I have used before and It worked really good as well, It wasnt as effective on tought spots like heavy where (front footweel) but did a good job overall with cleanig and brightning the dingy carpet in some of the cars I had.
I have been getting countless questions about my regimen, so I figured I'd just write up an article and post it. I'd like to thank my girlfriend turning my on to the OXY POWER! a little over a year ago. After playing with different dilutions, I've found a great method. Enjoy the read!
As a professional detailer I have tried many different methods to getting a carpet clean. Currently I use a method that lifts deep down stains and odors out quite well.
What you will need
-Hi-power wet/dry ShopVac
-Oxy Clean (the Granular)
-2 Gallon Bucket
-Medium Hardness Bristled Nylon Brush w/handle
-A good spot remover (I used Meguiar's All Purpose Cleaner diluted 10:1)
What to do
-Vacuum out the upholstery or carpet
-Mix in the 2 gallon bucket: 2 scoops of Oxy Clean and the rest with warm/hot water
-Stir it up with the brush and let it sit for 5 mins for the product to saturate into the water
-While it is saturating, spray your spot remover onto the surface generously, concentrating the spray on the heavier soil spots
-Proceed to then scrub the solution into the carpet. What I do is hold the handled brush and scoop some water with my hand onto the surface. Work in small squares (1'x1') when agitating and scrub front to back, left and right, repeating over each swipe. You will see the solution saturate into the carpet. Just scrub the solution in and move to your next area.
-When the entire area is saturated, begin where you begun scrubbing the first section. Proceed to extract the water solution out of the carpets/upholstery. I usually take the filter out of the ShopVac (more suction) for this and move slowly over the surface to insure complete extraction of the solution.
-When done, the areas will be damp. Leave the doors open with the dome light switched "OFF" and leave the mats in the sun. It should be dry in an hour or two.
-Let it all dry and Voila!
-Get some crevice tools for the Shopvac. It will help with vacuuming and extracting.
-For tight areas, agitate with your hands or a terry towel.
-For a spot remover, you should be just fine with something that is safe for clothing (IE: Shout Spray)
-Repeat if necessary. For deep stains, just apply the solution and let it sit for about 20 mins, then extract out.
Here are some pictures of the work I have achieved with the exact steps/products listed above:
Good Luck and post any questions back here.
Sean T. Busch
Detailing By Executive
2006 DG|G Infiniti G35 Sedan | 6MT
A great way to do carpeted floor mats if shampooing doesn't work is to use some kind of spot remover and scrub it good and then go at it with a pressure washer. Use the pressure washer until the water coming out of the mat is no longer dirty or until the stains are gone.
Has anyone ever heard of removing the stock seatcovers, washing them in a washing machine, letting them air dry (of course), and then putting them back on? I am considering doing this. My seats are bad. I just hope the upholstery doesn't shrink and I can't get it back on the seats. Any ideas?
Also for floormats, going with what was stated ^^ most car washes have these clothespin type things that are attached to the wall that you can clamp your floormats up and blast the crap out of them with the spray gun. I've had very good success with this before.
I'm trying to buy a Porter Cable Steam Cleaner at the moment, but now I use Tuff Stuff and a hard bristled brush. I clean the area and then use my vacuum to extract the stain with water. It works well, but not like a steam cleaner.