From time to time we do get the question how to clean a test chart.
The transparent charts are usually a film or a foil empbedded between glass plates. In this case simple glass cleaner can be used to do the work. Just do not flood the chart with the fluid and take care to clean the chart on both sides.
The reflective charts are made out of many different materials and here the cleaning is a little more difficult due to the fact that the surface is directly accessible. Dust and other little spots should be cleaned by using a brush or a very soft cloth. The surface is sensitive to mechanical harms. So please be very careful when cleaning these charts. Sometimes it is even better to leave the spot on the chart if it is in an area where it does not influence the functionality of the chart.
Whenever there are any question please do not hesitate to contact our support