5. Maintenance
If used frequently, the device, its keypad in particular, gets unavoidably dirty. Use a
piece of soft cloth moistened with clean water to clean the device. You are
recommended to follow the principles below while cleaning:
Do not use aggressive detergents (such as abrasives or strong disinfectants).
Clean the device in dry weather in order to make waste water evaporate quickly.
Warning
Prevent water from getting inside the access unit.
Do not use alcohol-based cleaners.