What are you guys using to clean the Blue Maxima FFT pour oil on your filters? I am giving up on the stuff and going back to No-Toil since the stuff is such a pain to get off. When I used No-Toil in the past I would clean it off easily and the filter would be yellow foam again. Not so with the FFT stuff. I soaked the filter in Kerosene, used laundry detergent, dish soap and hot water, simple green and a industrial de-greaser and nothing phases the FFT and I always feel like my filter is dirty when I re-apply the fresh oil to it. It's always sticky after many cleaning attempts and the filter is blueish/ black.