When I owned my Nitty Gritty, cleaning results varied greatly, depending on the length of time vacuum was applied. Too often, quick vacuuming leaves the LP partially damp and still contaminated with dissolved solids that later dry into the grooves.
I got a substantial performance increase, especially in residual noise removal, with the Nitty Gritty (and my current VPI cleaning machine as well) when I experimented between 2, 4 and 6 revolutions of vacuuming.
I now use only 6 revolutions or more of vacuum, based on listening tests.
There is no point in going through all the cleaning motions and then leaving stuff behind. I cannot promise this advise will help in your situation but it certainly will not hurt to experiment and requires only an additional 10 or 15 seconds.
I got a substantial performance increase, especially in residual noise removal, with the Nitty Gritty (and my current VPI cleaning machine as well) when I experimented between 2, 4 and 6 revolutions of vacuuming.
I now use only 6 revolutions or more of vacuum, based on listening tests.
There is no point in going through all the cleaning motions and then leaving stuff behind. I cannot promise this advise will help in your situation but it certainly will not hurt to experiment and requires only an additional 10 or 15 seconds.