While all exterior rated Gemini Letters, Logos and Plaques are guaranteed for life, there still may be some general maintenance required.
Most Letters & Plaques only require periodic simple cleaning - with a soft cloth, mild dish soap and water. Considerations must always be made for certain paints and finishes that may become scratched when cleaned. More sensitive finishes, such as polished do require extra care when cleaning. As a general rule - abrasives or cleaners with solvents should be avoided.