scrubbing lp with discdoctor brush and vpi 16.5

i have been getting mixed results with the vpi 16.5 and was wondering if I was not using the disc doctor brushes right.

I used the audio intelligent enzyme fluid then vacuum

I then used the audio intelligent cleaner fluid then vacuum

I then rinse with the distilled water from audio intelligent.

but how hard do you scrub with the disc doctor brush and what direction how hard do you press?

thanks

mike