Floating Forest Series , Acorn Disk, 2015 Polished brass Cleaning instructions Polished brass: As the item is unlacquered, it naturally oxidises (darkens). Upon touching the items without gloves, finger prints are likely to occur and leave marks. Use a good quality brass cleaning liquid and follow the product instructions using the extra soft dust cloth. Do not apply pressure on persistent marks. Remove them using repeated gentle motions and by reapplying the brass cleaning liquid.