How hard should I be scrubbing my......

RECORDS! What did you think I was going to ask???

Seriously - I'm using the Disc Doctor brushes and I'm just wondering how much pressure I should be applying to them when scrubbing. There seems to be a point where the nap on the brushes stops changing directions when enough pressure is applied.

You can feel this direction change through the brush when you're using it. I'm just wondering if I should be gently gliding the brush over the surface of the vinyl and letting the action of the fluid do the work or if I should be really scrubbing away on it with firm pressure applied.

Should I apply just enough pressure to allow the nap to switch directions when the direction of the scrubbing motion changes or should I apply ample pressure to keep this direction change from happening - that's the question.

Let me know your thoughts - you guys have been so helpful in the past!