I always use Maxima FFT in the pour bottle, it's really tacky and doesn't wash out. The only downside is that it's really hard to clean unless you use foam filter cleaning spray. I'm going to try cleaning it with kerosene and see how it works this weekend.
BIO twin air all the way. The filter was completely black after the fl race and not a spec of dirt got through. It is a bpain in the ass to clean and usually go through a entire jug of bio cleaner for four filters.