Take the carpet out and pressure wash with hot water.
Soak it with dish soap, scrub and suds it up with a little hot water, let stand for a bit, and then pressure wash it. Use a shop vac, or car wash vacuum to remove excess moisture. It should dry in a day or less. You could use your rig as a place to hang and dry it.

Looking at the dates on this thread, I imagine you've already done something though...hope it worked.