To maintain vintage coin banks, inspect banks for rust, chips, scratches and overall dullness. Depending on the metals used to build coin banks, remove all rust spots, and polish or paint to preserve the metals and original pain details. Periodically inspect the vintage coin banks, and repair any subsequent damage immediately.
Remove rust spots and stains from cast iron vintage coin banks using a wire brush or fine-grade emery cloth and oil. Apply paint or lacquer to coin banks to prevent further damage. Store cast iron coin banks in dry, low-moisture areas. Avoid displaying cast iron coin banks in bathrooms, kitchens and other areas prone to mold and mildew growth.
Maintain copper and brass vintage coin banks using lemon and salt or an ammonia solution to remove dust and other debris. Wipe with a dry, soft cloth to avoid scratching the metal surfaces. Display copper and brass antique coin banks in dry, clean areas. Wear cotton gloves when handling the coin banks as oils from fingers can leave fingerprints, which can corrode both copper and brass.
Painted tin vintage coin banks require additional care as original paint details can rub off during the cleaning process. Use a mixture of white spirits, linseed oil and menthylated spirits to remove surface dirt and debris without disturbing the paint. Apply a coat of wax polish to help preserve the paint. Place a piece of felt underneath tin vintage coin banks to prevent dents and scratches.