Advice on cleaning emblems

[TheHamburglar3]

I am looking for advice on cleaning the emblems on my 87 GN. It has been sitting in a garage in Houston, TX, for over 15 years. I don't want to replace them; I would like to keep everything original.

 

[Mr. Michael]

I have seen that before... I think a jeweler would have an idea or two. These are basically cloisonné crest so maybe someone in that industry could come up with something.