Pour an appropriate quantity of medal cleaner in a bowl. Soak the medal that you want to clean in this bowl for approximately 30 minutes. Cold water will loosen and also dissolve the accumulated dirt and grime to a great extent. Make sure that the medal cleaner you use is not very strong chemically; otherwise you will end up corroding the medal in no time.
After approximately 30 minutes, remove the medal and use a medium brush to gently scrub the medal. This will remove most of the tarnished build-up from the medal. You may have to repeat the earlier step if the medal was too much tarnished and you can remove the build-up.
Take out the medal from the bowl with medal cleaner once again and scrub the medal with a medium brush. Continue in the manner until none of the tarnished build-up remains on the medal. Remember that you should scrub the religious medal because if you use too much force, you may end up damaging the medal permanently.
Mix together a small quantity of baking soda and medal cleaner to make a paste. Apply this paste on the medal with a cotton swab. Scrub the baking soda paste on the medal for at least a couple of minutes.
Get rid of the baking soda paste and medal cleaner by rinsing off the medal under cold water. If the shine has not been restored completely, apply the baking soda paste and rinse off the medal once again. Repeat this step until the shine has been completely restored.
Finally, dry the religious medal patting it in a piece of clean soft cloth. Buff the medal with the piece of soft cloth to boost up the shine.
Store the medal in a dust and grim free place. This will ensure that the medal stays clean for a longer period of time.