Topside components include the control panel, computer, hand controller, TDS and and any accessory interfaces.
If the system is dirty, use a cloth dampened with a mild soap solution, and then use a cloth dampened with fresh water to rinse.
CAUTIONS:
Do not use a spray or dripping wet cloth to clean the topside components, including the TDS (the slip ring in not water tight).
The topside components should not be immersed in water.
When cleaning the computer screen or secondary monitor, do not use any abrasives.