Just bought a nitty gritty, hear no difference.

Hi folks,

So I bit the bullet and bought a Nitty Gritty Record Doctor III, which is distributed only through Audio Advisor. It's a cheaper version of the 1.0- same functionality, with a slightly more utilitarian design, and $100 cheaper. I've cleaned about 10 records with it, and I hear absolutely no difference between records cleaned with the vacuum machine and those cleaned by my $10 record brush. What's the deal? I'm following the instructions to a T... I'd love to hear your ideas.

Thanks!