I will inspect the area rug for its condition, in this very first step I will also find out what type of fiber or type of an area rug it is.
For a save cleaning area tiled, concrete or laminate flooring would be preferred, if hardwood is the only option then I would put plastic sheets under the area rug.
I would vacuum it thoroughly with my powerful commercial vacuum.
I would prespray with a safe prespray depending on the fiber of the area rug.
I will pre scrub with my scrubber.
I will extract the dirt using water.