HI,
I've made a very thorough reserch of different record cleaning methods, from Doing-It-by-Hand to TOTL vacume machines. It included both listning and checking the cleaned records under a scope.
The spinning machines were the most efficient, and certainly most cost eficient way to clean records - easy and quick to clean records without doing damage to either records or labels. Records turn our cleaner than "handworked", and just as clean as those cleaned by multiple-thousends-dollars, TOTL vacume machines.
Mind that, Just as with the vacumes, the cleaning process is much more elaborated than advertise, and one needs quite a few rounds of turning the records, both ways, both in cleaning solution and in distilled woter - for it to be "almost totaly clean" - which is the best I have managed, cleaning VERY dirty records, using any method