How can I clean the surface contact board on the bottom of the rugged tablet?

The surface contacts on the bottom of the rugged tablet are silver plated, which is common plating for electrical contacts. They will remain functional even if they are slightly discolored. To properly clean the surface contacts, we recommend any readily available non-abrasive silver polish, many of these polishes contain an anti-oxidizing agent that will slow future discoloration. A pencil eraser should not be used on the contacts as it will erase the silver plating relatively quickly, allowing corrosion to occur at a faster rate, which will cause failures.