Dismantle the top glass of Tamron 70-200 2.8

there is some dust inside my Tamron that I would be better leave where it is. However I noticed that it could be quite simple to dismantle the top glass of the lens, cleaning it and put it back. Thoughts?

I would leave well alone. The glass could be put back decentred and if you get the torque wrong when refixing you could distort the shape of the element.

Have you seen this? :
https://www.youtube.com/watch?v=NGgRqqu4Bkw

I recently successfully cleaned the inside of the front element of a Tamron 28-200mm. Mind, I mislaid one of the tiny screws for a week after it bounced to goodness knows where but OK now as I eventually found it!