Joe,
The best way I've found to remove everything from carpet is a dilluted solution of Era (laundry detergent) and water, in a spray bottle. Just mix about 1-2 oz of Era in a standard spray bottle, spray on the area you want to clean, let stand for a few minutes, then using a rag or scrub brush, remove the stain, works great.
A few weeks ago, I removed my entire interior, and cleaned the carpet with this, looks like new again. A few years ago, my thermos filled with coffee leaked all over the rear carpet (tan interior) the stain was about 2' x 1', the mixture removed the stain in no time, permenatly.
Rob