Beyerdynamic MCS 50 Notice D'utilisation page 33

1.4 Maintenance of the MCS Microphone Units
For cleaning the MCS microphone units when they are slightly dirty (finger prints, dust, jam or juice) use a soft, damp cloth, sponge or brush and a
liquid cleaning agent. Before cleaning the surface it must be moistened thoroughly. Afterwards it must be cleaned with clear water. Make sure not to
allow any water to enter the unit. For dirt caused by mineral oils and fats, animal and vegetable fats use spirit, isopropyl alcohol or benzine.
For dirt caused by ballpoint pens, typewriter ribbons or carbon paper use isopropyl alcohol or spirit.
Clean the supplied pop shield with clear water. Make sure that it is completely dry before you put it on the microphone again.
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