This video on how to clean a microfiber sofa suggests using rubbing alcohol, also known as Isopropyl Alcohol, to clean your microfiber sofa. Although, Isopropyl Alcohol is used in some industrial cleaning applications it's not really a cleaner, its mainly used as an antiseptic and can be toxic in large doses. It's about 70% straight alcohol and mixed with water perfumes and some oils. As a professional carpet and upholstery cleaner in Tampa FL I would not recommend using Isopropyl Alcohol to clean microfiber.
In the how to clean microfiber video the host uses a stiff bristle brush to soften the sofa fibers after she has done her cleaning. The reason her sofa feels stiff after cleaning is because the rubbing alcohol has removed any moisture from the fiber leaving it dried out and stiff. I don't recommend using a stiff bristle brush to soften the surface. Professional upholstery cleaners use a horse hair brush to agitate solution and remove stubborn soil. Horse hair brushes are much softer and will not damage microfiber surfaces.
If you looking for an easy microfiber cleaner I have listed a quick recipe and instructions below:
2 spray bottles
3 cups water (24oz)
3/4 cup of vinegar (6oz)
1/2 tsp of dish washing soap
1 clean white towel
How to clean microfiber:
Mix all the ingredients together in a spray bottle and shake it vigorously. Spray the soiled areas or the entire sofa. Roll up the towel and agitate the solution on the surface. Fill the 2nd spray bottle with water and lightly spray the same areas. Wipe it one more time with eh towel and you will have removed the majority of the soil. It's safer the rubbing alcohol and does a much better job of cleaning.