A clear filter line will delete the slot number specified or all slots and consequently all filters that have been created by a user.
Syntax: clear/spots [0-9]
This will clear any or both accept and reject spot filters in slot 2.
This will clear each and every user spot filter - it will clear out all filters in all slots.
Note - if you just want to replace a spot filter, enter the rule again (with a line number) and it will overwrite the previous filter in that slot. If you forget the line number, it will overwrite the filter in slot 1 by default.