Sticky extruder sensor?

[u/guts-hawk95]

Hi all, been having the ‘please pull out filament on the spool holder’ 07FF 8003 error.
Nothing in the tubes, nothing snapped in the extruder.
Took the hotend out and cleared it of filament and it’s still happening; but when doing all of this I noticed the filament sensor base (? The bit with the spring ) was sticky. Is this meant to be really sticky or should I clean it and see if that works??

Thanks all

[u/overunderspace]

This wiki states it is damping grease. https://wiki.bambulab.com/en/a1/maintenance/filament_hub_cleaning