You could first soak them in hot water (hot enough to melt the glue on between the lenses), separate the lenses, then get rid of the mold with whatever cleaning supply, then tape it back together with double sided tape. I did this (it totally wasn't an accident
) when I somehow go hot chocolate in between my lenses, and then I rode with them till the end of the year, still no fogging problems
Disclaimer: do this at your own risk