TechniSat DIGITRADIO UP 55 Instruction Manual page 112

You must not use scouring pads, scouring powder and solvents such as alcohol
or petrol.
Do not use any of the following substances: saltwater, insecticide, chlorine-based
or acidic solvents (ammonium chloride). Do not use spirit, thinners, etc.; you
could damage the surface of the device.
> Clean the housing using a soft, damp cloth.
> Only clean the display with a soft, cotton cloth. If required, use a cotton cloth
with small amounts of non-alkaline, diluted, water-based or alcohol-based soap
solution.
> Gently clean the surface using the cotton cloth.
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