The wiper stalk comes off quite easily. You can then unplug the wires to the loom.
Can’t find the Google link at the moment showing how to place a thin screw driver to lift the stalk assembly over the little pin. But it is somewhere. On the discovery forum iirc. Just caution when removing the small tail lead as the tab it sits on is brittle.
I recently finally found the cause of my washer problems. Chafe on wires into loom. You may have something similar.
