The electrical insulating mats should not be exposed unnecessarily to heat or light or allowed to encounter oil, grease, turpentine, white
spirit or strong acid. It should be placed on a clean, smooth floor and the feet should be positioned in the center of the electrical mat.
When rubber matting becomes soiled, it should be washed with soap and water at a temperature not exceeding 65°C, and
thoroughly dried. If insulating compounds, such as tar and paint, continue to stick to the mat, the affected parts should be wiped
immediately with a suitable solvent, avoiding excessive solvent use, and then immediately washed and treated as described
Here is a Post Purchase Guide to Electrical Insulating Mats.