Ducati MULTISTRADA 1200S ABS 2015 Workshop Manual page 72

Draining the clutch hydraulic circuit
Warning
Clutch fluid is corrosive and will damage paint. Avoid contact with eyes and skin. In case of accidental contact,
wash thoroughly with water.
Remove the cap to expose the bleed valve (3).
Connect a clutch circuit bleeding tool to the clutch slave cylinder bleed valve (3).
Note
Follow the manufacturer's instructions when using a commercial clutch bleeding tool.
Remove the cover (1) with the membrane from the clutch fluid reservoir (2).
Open the bleed valve and pump with the bleeding tool until no more fluid flows out.
If you do not have a bleeding tool available, attach a transparent plastic tubing to the bleed valve (3) and insert
the other end of the tubing in a container for old clutch fluid placed on the floor.