Stainless Steel – The best method for cleaning Stainless Steel is simply good dishwashing soap. Rinse in hot water and dry with a soft cloth or allow to dry naturally. Please do not use any harsh or other chemicals, as we can not guarantee the effect it will have on letter finishes. Brass cleaning –  Start with hot, soapy water and a microfiber cleaning cloth: Go over all of the surfaces with the cleaning cloth, you can use a clean toothbrush very gently to get into any crevices. Rinse with warm water and dry thoroughly. For all plaques avoid using metal-bristled brushes, or steel wool; these will scratch the surface of the brass.