Hi Xtina, Hope you are enjoying getting ready for Christmas. Maas is a good cleaner. I use it here in Spain and didn’t realize you had it in the states. A good museum grade preservative for metal is Renaissance Wax. Best used after a good cleaning. It’s a little expensive but works good to keep fingerprints off. It’s good to remember you are not fighting the silver but the copper content in the silver. Pure silver doesn’t tarnish but the copper that is added to the mix does. If you are dealing with a copper based silver plated items you will normally get more tarnish where the plating is thinnest or if it is sterling ( silver and copper mixed) then there may have been too much heat or work done or even chemicals at some point in some areas that has brought the copper to the surface to tarnish.
Some purists would hate me for saying this but you can reapply a patina with chemicals if you want to. Clorox bleach will turn silver gray like a normal aged patina. Liver of sulfur will turn it black and is often used to darken crevices before the final buffing of the highlights. With both the longer it stays wet the darker it gets and with both this is an oxidation process that is damaging the surface of your metal. But hey, so is the long process of waiting for it to tarnish to your liking. 
Hope this helps, Kyle
1 Like