Pewter is a soft material that requires careful treatment. We recommend using cotton gloves when handling pewter. Objects that are not being used can be stored in a plastic or felt bag to avoid scratching.
It is generally recommended to avoid using polish on pewter, since it can cause scratches. To remove fingerprints and other stains, rinse the pewter in warm water with a small amount of dish detergent. Dry with a soft cloth. For more advanced cleaning of pewter objects we recommend a professional restorer, for example, KA Johnsson in Stockholm.
Keep in mind that humidity can damage table tops and other surfaces. Wipe the vase dry immediately after filling it with water, and always keep it dry to reduce the need for polishing.