With constant wear, the item will eventually get scratched, lose its shine, or may bend. The item may also tarnish over time — this happens in a humid or warm environment, or when interacting with sulfur, which is contained in the air and human sweat. Therefore, it is better to store items in a dry place, separate from each other, and after cleaning the items (which is easy to do at home), you can restore them to their original appearance.
To clean, immerse the item in a warm soapy solution and then wipe it dry with a soft cloth (microfiber or suede will work). Another option is to clean with a soft toothbrush and a small amount of toothpaste. To remove dark tarnish, rinse the items in a warm soapy solution, and then wipe with a thick cloth with a splash of ammonia solution. After this, you should rinse the items in running water and dry them. Special cleaning cloths for jewelry are also sold in jewelry stores.
Do not use hard brushes, abrasive substances (powders, baking soda), or sandpaper for cleaning — this can damage the item.