TechniSat VIOLA 3 Mode D'emploi page 103

Clean the housing using a soft, moist cloth. Do not use spirit,
thinners, etc.; you could damage the surface of the device.
Only clean the display with a soft, cotton cloth. If required, use a
cotton cloth with small amounts of non-alkaline, diluted, water or
alcohol-based soap solution.
Gently clean the surface using the cotton cloth.
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