Stop PixelMap FX

So. Im recording a Timecoded (tracking) and in the middle of my cuelists Im using some PixelMap Effects. I had no problems to create the desired Effect and Record it, but the problem is that I dont know how to "clear the PixelMap Layer Information".
I know that if I set a color to the fixtures they will refer back to the color pallet and Im fine, but if im going to create a second effect on the same layer using the FX engine, the old effect will be tracking unless I set all the values of FXs to zero back again (its a little bit more complicated then it should). Is there any way to just "knockout" the FXs information for the next cues?
Thanks