Open the trunk and check for signs of mold and mildew. Remove the lining paper if there is any sign of mold. Most steamer trunks are lined with a plain or decorative paper. If glue is visible, use adhesive remover to clear the residue. Gently scrap off any glue with a putty knife. Work carefully so as not to scratch the interior.
Dip a cotton cloth in a solution of 1 part bleach to 9 parts water. Gently scrub the inside of the trunk to remove any mold or mildew. Do not to allow the bleach solution to come in contact with the alligator covering as it can cause significant damage. Set the trunk outside in indirect sunlight with the lid open for four hours or until thoroughly dry.
Reline the inside of the trunk. You can use wallpaper, decorative lining paper or any craft paper of your choice. Alternatively, you can sand and stain or paint the inside of your steamer trunk.
Check the outside appearance of the trunk. Use rust remover to clean rusted hardware and oil soap to clean the wood trim -- remove them first, if possible, to protect the leather. Remove damaged nails with a pair of pliers. Repair or replace damaged wood trim, locks, hinges and corner reinforcements.
Use a damp cloth and water to clean the alligator covering. Dry thoroughly. Polish the leather using a cotton cloth and alligator leather conditioner. Alligator leather is easy to damage. Do not use another type of leather cleaner or leather polish as it can destroy the finish. Gently buff the entire leather trunk carefully.