Miriam Haskell Vintage Floral Pearl Wreath Brooch Needs Cleaned

I hate to part with this because I love it so much. It's 2 x 2 inches and has lovely flowers around the circle. Each Russian gold flower has a faux pearl center. All are hand wired in true HaskelI style. It is signed in a cartouche on the back of the piece. The pin is still very straight, and closure works properly. It needs cleaned, but I'm afraid to do so. I would hate to damage such a pretty piece of history. So I am selling this as I found it. I would rather pass it on to someone who knows how properly. Please check photos and feel free to ask questions. Thanks for looking ❤️