Silver tarnishes from the exposure to the air in your house.
Tarnish does not hurt the silver. It usually only has to be cleaned and polished a couple of times a year. If you like it can be kept up by lightly using a commercial silver polishing cloth or gloves.
There are good commercial silver polishes available supermarkets or hardware stores. Just remember, any polish that you have to let dry before polishing is abrasive, will scratch and is not recommended.
Using a buffing wheel can wear the silver and can affect the design, decoration, engraving and maker’s marks. All of these can hurt an item’s value.
Silver dip should only be used by someone that knows what they are doing as it will literally remove all tarnish. Be careful. Some “tarnish” was applied to highlight decoration. Silver dip is NOT a polish. It’s a cleaner and leaves a film on the silver that must be polished off later.