Using the Deltana 4 - inch Residential Letter L is easy. Just pick a suitable spot on your entrance, whether it's your home or business. Clean the area first to ensure a good adhesion. You can then install the letter following the standard installation process. When it comes to maintenance, simply use a soft cloth to wipe it regularly. Avoid using harsh chemicals as they may damage the finish. If the letter gets dirty, you can use a mild soap and water solution. As for the finishes, they are quite durable, but try to keep it away from extreme weather conditions for long - term use. That way, your letter will keep looking great for years to come.