The best way to clean Plexiglas is by using a small amount of liquid dish washing detergent, a set of clean soft cloths and a set of clean soft sponges. The Plexiglas should first be cleaned with the soft cloth and then the soft sponge for tougher stains.
The process for cleaning Plexiglas begins by combining 1 or 2 tablespoons of liquid dish washing detergent with 1 or 2 gallons of warm water in a clean bucket. The measurements can be increased or decreased depending on the size of the Plexiglas that requires cleaning. Thoroughly wet a soft cloth in the solution, and wipe it over the Plexiglas. If the cloth becomes soiled, use the reverse side or a new cloth. Always ensure the cloth is wet as a dry cloth presses the dirt into the surface.
After using the cloth over the surface of the Plexiglas, soak a soft sponge in the solution and use it to clean the remaining soiled areas. As a soft sponge is slightly more abrasive than a soft cloth, it should remove the more difficult stains. Be sure to rinse the sponge continually to remove debris and keep it wet. Finish by soaking a new soft cloth in clean water and rinsing the Plexiglas.