Regular cleaning should be carried out to maintain your sign. LED illuminated signs can be cleaned with warm soapy water. Use a mild detergent, such as regular dish soap. Avoid using harsh scrubbing brushes as these can scratch the surface and affect the look of the sign. Instead, you can use a regular sponge (without a scouring side) and a clean towel to dry the sign. To leave the sign without any water spots, you can use a microfiber cloth to dry it thoroughly. If your sign is installed outside, then you may, on occasion, need to spot clean it. You can use a spray bottle cleaner, such as Windex, and a clean cloth. Avoid using paper towels as these may break up and cause a mess, and you should also avoid using any harsh or abrasive cleaning products.