In order to maintain the prints on your bottle(s) well, try to avoid rubbing them against rough or sharp surfaces to prevent scratches.
It's best to protect your bottle(s) from humidity, extreme temperatures, and prolonged direct sunlight. Also, steer clear of harsh chemicals to keep them in top condition.
The use of undiluted baby bottle detergent and bottle brush is sufficient for the purposes of washing and maintaining the products in good shape.