You will need the following;
A bucket
A replacement none return valve
Pliers
Pipe/wire snippers (to cut water pipe)
Fresh water
1) Drain screen wash bottle to remove any remaining gunk and fill with water.
2) Fold rear seats forward to enable removeal of side pannel
Locate the none return by...
To remove mirror glass you'll need a flat head screwdriver.
Push the base of the mirror down at the point 'X' in the pic
Then place the Flat head screwdriver behind the mirror glass as the top around the area that the arrow points to in the pic.
Now push the screwdriver away from you to...