plastic triangle by the door mirror water leak

[Bauhaus 3]

Does anybody know how to remove the plastic triangle trim piece by the door mirror on a 91 Corrado G60 ?.  I think I need to remove both interior and exterior parts as I have a small water leak which trickles down the passenger door card and over the door speaker.

[1xshaunx1 27]

Inner just pops off with a flat edge, it only clips on. 
outer has a screw from the inside holding it place, there is a plastic cap on the screw head to be popped off

[Philly-R6 0]

Adding to Shaun, use a heat gun to get a little warmth in the plastic and slide the outside triangle off (toward the front of the car from memory).
There is a flat plastic hook affair which slides into the metal door frame.

Take your time and do not break it!

[Bauhaus 3]

Thanks for the replies gents.... I will be attempting to remove and fix this over the weekend, hopefully with no breakages 🙁 .

[Bauhaus 3]

Ok took the interior plastic triangle off but not sign of any nut to undo for the exterior part, I take it the three tabs that are visible are holding in the exterior triangle ? or am I wrong...  I don't want to be breaking anything obsolete...does anyone know how the exterior bit comes off ?

[seanl82 23]

49 minutes ago, Bauhaus said:

Ok took the interior plastic triangle off but not sign of any nut to undo for the exterior part, I take it the three tabs that are visible are holding in the exterior triangle ? or am I wrong...  I don't want to be breaking anything obsolete...does anyone know how the exterior bit comes off ?

It's the button just underneath the right hand side of the triangle in this pic. The button is a screw cover