Silicone stains

[Sean Govaerts]

So I am reusing some old aquariums, one of wich is for my alligator snapping turtle. The aquarium is not full, beceause of this the old silicone line for a divider is visible.
Does any body have any suggestions to remove this, i have used vinegar and razorblade so far (not with the turtle in it).

 

[LBDave]

Ulu Can you assist?

 

[Lepisosteus]

Razor blades should take off any residue. Try using a fresh blade. Acetone works as well for light residue.