But there is just one problem IMO
I think the thinner would do something to silicone as well wouldn't it?? I am not sure but if it can remove paint what will it do to the soft silicone.
This is just my opinion so please just find out before using anything otherwise you would have to replace the whole tank and not just the front panel.
If I were you I would take the tank into a glass shop and just get the front panel replaced, I just think it will be the safer bet.