Chemical Guys Foaming Citrus Fabric Clean Carpet And Upholstery Shampoo And Odor Eliminator (16 Fl. Oz.) (CS 12)

The title says it all, but remember that because there's no detergents or highly concentrated chemicals, things will take a little more time to remove. It's super easy to use for a shampoo, and as long as the surface area you're trying to clean has been prepped, the shampoo will work with a little time and scrubbing. Even if you have a hot water extractor, I highly recommend using this shampoo before the extractor as it will help suspend dirt and dust much easier. As a personal preference, I use the Carpet Brush with Drill Attachment to really get the foaming going; it's only going to make cleaning easier and the carpet/upholstery better looking in the end. The two photos (below) are from an EEEEEEEXTREMELY neglected and abused Avenger, and a WRX STi (2009 I believe). This is after vacuuming off the shampoo by using a combination of the shampoo and brush (attached to a drill). Nearly everything is gone. Use this in concert with the Lightning Stain Extractor, and you're golden. Remember, this is almost totally natural, so its ease of use and effectiveness is going to be different than harsh chemicals. But, I'd take that any day over a product that puts a customer's vehicle (and my insurance/reputation) at risk.