Welcome to the thread.
Silver will tarnish over time but the good thing about silver is that it can be cleaned pretty easily. I don't keep my Pandora bracelets in a separate plastic bag, I don't really pamper it much to be honest, I wear it all the time, sleep with it, etc. The only thing I am careful about is not smashing it on hard surfaces because of the Murano charms. As for cleaning, I clean everything from time to time, usually with the Pandora cleaning cloth or a dish washing liquid.
thank you
