Do not attempt this if you are inpatient, or you will end up breaking the glass and maybe hurting yourself.
I realise on the above pic it says Brava on the headlight but it is off a Marea.
Time required: 50 minutes
Tools required: 3 flat bladed screwdrivers, large, small and another in between. Best option would be a hot air gun, or a powerful hairdryer would work but will probably take longer.

Now heat the bonding with your hot air gun. I started from the right, Heat from about where the clip was and work your way right and down the side, don’t keep the gun in the same place for too long as you will melt the plastic. Once you feel the bonding is soft enough take your small screwdriver and scratch out all the softened bonding, don’t worry if it sticks to the glass it will come off easy later with a little rub. It dries and goes hard quite quickly so repeat the above till you have removed most of the bond.

Now from where the clip was work your way left across the top heating and scratching all the bond out just like your did previously, but do take your time, don’t rush anything.

Once you have removed most of the bond from the top and both sides, place your middle size screwdriver in the gap (again where about that clip was), and try to lever the glass away, but be gentle. If you don’t see the glass move at all then you need to remove more bond. If you do then just keep tweaking it a little and work your way across the top of the light, once it feels more loose lever it properly and use your large screwdriver to hold it open, you will see more bonding start the stretch as you lever the glass.

Download pdf Removing glass from Marea Headlight