i havent heard of any way to fix a merked lens.....but when you wipe the inside of your lens and it is wet your not suppose to wipe it let it dry and once its dry you can wipe it with your cloth as long as your cloth is dry. i had a pair of lens i did this to i uses a razor and cut out the inside part of the lens it just clear and made for the anti fog. the inside of the next lens should be perfect hope this helps
NS brother