How to disassemble Bare Trio C Mask

[Hoots13]

I'm just wondering how to disassemble a Bare Trio C scuba mask that i found on a recent dive. It seems brand new except for the bit of green gunk that's in some of the crevasses (not sure of spelling but you get the idea). Is there a way to take the mask apart to give it a good cleaning without breaking/cracking it? I love finding treasure underwater Any thoughts or ideas would be appreciated.

 

[RJP]

Most masks are a "no user-serviceable parts inside" sort of thing.