Welcome to Android Central! If it's fogged on the inside of the lens, that can be hard to get rid of. You could try sealing the phone in a bag of uncooked rice or a bunch of those silicon desiccant packets (the ones that say DO NOT EAT and that come with various packaged items to keep them dry). Use a Ziploc bag and leave it along for about 48 hours -- hopefully the desiccant can pull out the moisture.