Sea glass collects natural skin oils than can attract dirt. It is easy to clean your sea glass. Just wash with soap and hot water to remove any oils, returning it to it's natural beauty. Mineral oil can be used to condition the glass for a clear look if one desires.
If the sterling silver should tarnish simply clean with a silver cleaner liquid or polishing cloth designed to clean sterling silver. Be aware that some silver cleaning clothes and products should not be used on pearls.