Found this at MB World's forum:

Regardless of material type or quality, a dirty micro fibre, or a 100% Cotton towel will scratch, Micro fibre has attractant properties, that is dirt, dust, and various other substances cling to it, which is one of the reasons that it works so well, but it is also a reason why you need to be extra careful when using towels on your paint

To ensure your towels and buffing clothes provide long-term use, wash them frequently in a liquid soap (Micro Restore) in hot (120oF<) water, add a teaspoon per towel distilled white vinegar, the vinegar doesn't coat the fibres but instead works to eliminate detergent residue and finally a thorough cold rinse. Always wash micro fibre separately and only with other micro fibre fabrics

The most important criteria for any fabric used on a vehicle surface is its quality and scratch resistance.
A couple of ‘non-scientific tests’ you could use to assimilate wither or not a towel will cause scratches, they are not at all scientific nor 100% accurate, they are only indicative of what the towel may do to your paint surface, but then which is preferable to scratch a CD or your paint surface? Ensure the towels have been washed before carrying out these ‘tests’. If the towel does scratch the CD’s surface that doesn’t necessarily mean that it will scratch the vehicles paint, a CD has a much softer surface than automobile paint so use caution, initially trying an inconspicuous area

1) CD Scratch Test- with a micro fibre cloth, using medium to heavy pressure rub the data surface of a CD. If no scratching is evident then it probably won’t scratch the vehicles paint surface, be aware that the bindings can also cause scratching. On first use of a towel use it on an inconspicuous area first.

2) Burn Test- to test a material for polyester content, light a thread, if it emits a black wisp of smoke and then shrivels up into a black hard ball, its polyester and will probably scratch your paint.

Information resource- DF Alpine™ - DF Concours cotton microfiber towels | auto detailing products | water filters | glass and surface cleaners Autogeek - Learn About Microfiber. Microfiber towels & tools are the future of car care detailing!

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