When stains first occur, it is important to clean them with a low ph balance soap. Drying with a hair dryer is important. Once water has set and created a ring, the furniture may need to be professionally cleaned.
You may try cleaning your new microfiber sofa with soap and water, only to find that you've left rings of water on your fabric. This is not "dirt" that you just spread around that can be cleaned by using more soap and water.