Hey Roma,
It's great so see you in your environment in Thailand. Thanks for sharing.
When you get the lens back, could you ask them what they did to it? To take a lens apart, clean it and put it back together takes quite a bit of expertise and precision, maybe they have other methods...
Anyhow, thanks for sharing and keep it up!
B
PS: Sorry that you need to leave Thailand, I've only been there once but I really liked it.