Winning an award plaque is an honor for anyone, regardless of what it’s for. However, keeping bronze award plaques shiny and looking like new can be a chore. Melynda Sorrel gives us some tips in her article for eHow on how to clean a bronze plaque and even some reasons that you might have one to start with.
Source: http://www.ehow.com/how_4968042_clean-bronze-plaques.html
Bronze award plaques sit outdoors and commemorate things as mundane as park benches or as grand as a cathedral. But being exposed to the elements does tarnish them. And they are easy to clean with simple products you can find in your home.