To clean the glass integrator bar we recommend that you use a dry, microfiber cleaning cloth. You can find this cloth available at camera shops and dispensing opticians, microfiber cloths are typically used to clean photographic lenses as well as optical glass. The fibers are so small that they actually get under dirt or other contaminants and lift them off surfaces, without assistance from solvents. When the cloth becomes dirty, you can wash and dry it and use it again. The retail price can vary depending upon the size and thickness of the material.
Many brands are available, and all seem to perform well.
Cleaning Method Wear cotton, film-handling gloves to help prevent absorption of finger oils into the microfiber cleaning cloth. The oils cause the cloth to become soiled more quickly and to require more frequent washing. Then with a lighter pressure, wipe the full length of the bar in only one direction. Care of the Microfiber Cleaning Cloth Use nothing but the microfiber cloth to clean the scanner integrator bar. Store the cloth in a bag or box to keep it clean when not in use.