The external housing of NavVis VLX can become dirty after handling. This includes the:
Frame
Folding mechanism
Head and body
Procedure
Remove dirt and dust.
Use a damp cotton cloth or sponge to remove loose dirt and dust.
Clean gently.
Put a few drops of isopropyl alcohol on a clean cloth and gently rub the surface clean. Do not apply isopropyl alcohol directly to the NavVis VLX.