Help cleaning LPs, residue left behind

i've started noticing a ?residue? on the outer edge and dead wax of some of the records i clean. its on records cleaned with and without a rcm, with and without water. the spots look like evaporated liquid perhaps, and they take up the area between the grooves, but do not run up to the grooves themselves. i am using nitty grittys formula 2, last 3 and nano-pure/milli-q water. any advice? am i using too much, too little, is the water too pure? is this normal? whats the deal?