This Bachelor in Textile Technology must've been sleeping through several of his/her classes.
The facts:
Break down the word microfiber - micro (very small) fiber.
Microfiber is defined as a fiber having a fineness of less than 1 denier. Denier is defined as the mass (weight) in grams 9000 meters of a given fiber. Thus a fiber of 1 Denier is 1g/9000m. Some microfibers being produces have a denier of 0.001, which is 1000 times finer than a fiber of 1 denier. Naturally occurring Cotton is in the area of about 30 denier. Naturally occurring silk is in the area of 10 denier.
As a reference: The nylon fiber used in luggage and backpacks is typically 600 denier. The nylon used in hosiery (pantyhose) is typically about 15 denier. For nylon to be considered MicroFiber, it must be < 1 denier. Typically, it would be much, much finer than 1 denier for Autopian applications.
Microfiber describes only the fiber used, and has nothing to do with yarn or fabric construction. It is possible to construct similar fabrics from normal fiber and from microfiber, but they will have vastly different characteristics.
Similarly, microfibers of different polymers (Polyester, PolyAcrylic, Nylon) will also have different characteristics from each other, even at the same denier.
Microfiber can only by man-made, as cotton/wool/flax/ramie does not naturally occur in fineness anywhere near, much less under, 1 denier.
The ability to scratch a surface has to do with both the natural hardness of a product, and with it's rigidity. Microfiber has similar physical characteristics as the normal fiber, but because it is much finer (greater length-to-width ratio), it is much less rigid. Take for example Glass: A shard of broken glass is very rigid, and can scratch some surfaces very easily. A strand of fiberglass has the same chemical composition, but is much more flexible than a shard of glass, and will bend or deflect before scratching a similar surface.
Because of its inherent fineness, each gram of microfiber has many times more surface area than a gram of the same polymer in non-microfiber form. This means that there are many hundreds or thousands of times more fibers in a MF fabric than in a similar non-MF fabric.
This additional surface area of the fibers is what gives MF fabrics their usefullness for Autopian needs. It is what allows an MF cloth to absorb so much more water (surface tension holding more water to the much greater surface area of the fiber), and what allows MF cloths to buff off waxes/sealants so easily (think 4 razor blades versus the old single blade).
Googling for Microfiber will yield far more info for those who are interested.
Yes, laundering an MF fabric is more difficult that laundering a similarly constructed fabric of normal fiber, but that is not truly applicable to what we are using it for.
If you wipe your dirty car down with an MF cloth, you will have dirt that will most likely remain embedded in the fabric. Question is: After visiting this site a couple of times, who would do such a thing?
Typically, Autopians are using the MF cloths to wipe down a previously washed (thus perfectly clean) car.
It is not applicable to compare specifications/requirements for apparel and for cleaning. These are two different uses, two different fabric constructions, and two different behaviours of the products.
I sincerely hope that the BS in TT didn't get their degree from the same institution that issued my BS in Textile Chemistry. It would concern me greatly for the future of our industry - which already has enough problems (severely threatened by foreign competition).
PS: Yes, I am a MF user for all Autopian applications!