Also, could you elaborate on the Tide+Dawn mixture and the cleaning apparatus used to make the carpets look that good? Mine badly needs cleaning.
I took a generic spray bottle found at target/lowes/wal-mart etc. and filled about 1/4" with Dawn, and about 1/2" with HE Tide - the rest water. I used HE detergent just because I have an HE washing machine. HE detergent is supposed to sud less. It still suds a lot, but if you don't have HE detergent I would suggest only using 1/4" of detergent.
I sprayed the whole carpet and let it soak for about 30min to an hour. Hit the stains with some extra spray. But not too much because you be dealing with more soap than necessary.
If you have any really grimy oil/grease stains. Pre-treat those with some bug and tar remover first.
For the actual cleaning, I used a generic cleaning brush and scrubbed the mess out of it. For coffee/soda spill areas you have you hit those a lot harder of course. Then I soaked it with some water and took my shop vac to it. Shop vac will fill up quickly because of all the suds from the soap. Having to dump the shop vac every 2 min is the only bad thing.
I repeated the same process about 4 times:
Spray/Scrub/Soak/Vaccuum
Spray/Scrub/Soak/Vaccuum
Spray/Scrub/Soak/Vaccuum
Spray/Scrub/Soak/Vaccuum
After all that, I laid it out to dry. The bottom padding will get soaked and the whole carpet will weigh about 50lbs wet. I let mine hang over the deck railing to let all the water drain out. Flipping it ever hour. To fully dry its going to take about 2 days in the sun. Once it was dry I took some scented Lysol to the carpet padding and soaked it. Let that dry, and I was done. It seems like a very long, long process. But for anyone who can live without carpet for a few days I would suggest it.
Make sure the bristles on the brush you use are soft/medium density. You don't want to mess up the nap of the carpet.