How to keep my my muffler from rusting and clean?

Hello everyone!! I just installed a bolt-on muffler made of stainless steel on my civic? I want to take good care of it and wandering what should i use to keep the muffler from rusting and take put the fingerprints out. I tried to wipe it out and the marks are still there. Can anyone suggest any products to keep my muffler nice and clean? THANK YOU!