• Bring the vane down from its mount, and remove the battery
• Place the vane upside down with the wind instruments hung over the end of the bench/table (for protection)
• Take the permitter screws out of the base of the vane
• Unplug the wind instruments from the ‘top’ of the vane – this makes it easier to work with the bottom only

• You'll see a small black panel (PCB cover) which has wires leading into it - yours will have 'hot glue' where the wires are.
• This glue needs to be gently jemmied up to allow movement in the wire and PCB cover.
• Once the hot glue is mobile then you can gently lift the panel and unplug the large plug to the left (yellow arrow), now with this undone you can now access the board, and undo both plugs at the top (blue circle)
• The looms into the PCB are all 'plug and play' - you'll find a very small pinch clip on the 'open' side of the plug:
   
• The PCB can now be removed for cleaning as needed - you can use methylated spirit, contact cleaner and a clean lint free cloth for cleaning - ensure the sensor board is dry before returning it to the vane body.
  

• Canned air is a great way to blast out any debris in the body, casing and pins - this can be better than a cloth in many cases.

• Once the PCB is clean you can then plug the power and sensors back in. The rain sensor is a bar which sits directly above the rain spoon on the top of body of the vane - this can also be cleaned.

• You don't need anything special - methylated spirits can be used to clean everything (except the solar panel) in the vane as needed. 

You can then put the vane back together, and test.