It's Hazard Emitters and any source of a ridiculous amount of shield regen (pre-fix Omega bonus, TSS2+EPtS3+Rotate Shield Frequency, etc.). The latter doesn't clear the debuff, but makes sure that the shields stay up despite the Borg's best efforts.
Not that it's really worth your time to do it, since they can use this retarded ability far more often than you can use HE. More effective to focus all of your remaining shield power into the quadrant facing the enemy, since the drain effect applies to each quadrant and leaving your shields balanced will drain them 4 times faster.
I'm finding Hazard Emitters to be utterly useless as of late because the Borg simply reapply their neutralizer. Sometimes twice or 3 times in a very short time frame (I've had 2 concentric sheild debuff rings on my ship, both from the same attacking cube).