How effective is US cleaning using only water?
I think all will agree on the importance of the cleaners themselves. Otherwise, wouldn't everyone be using only water?
Yes completely agree on the importance of the cleaner solution.
Never had much luck with plain water, distilled or tap, so quickly removed it from the trials. Some claim US works with distilled but could not visually prove a significant amount of particles were removed. US with some sort of surfactant really cleans the groove.
Not sure if there is any interest but here is some additional detail on the size of particles in the grooves.
The particles a vinyl collector is trying to remove range in size from 2-5 um (microns) at the bottom of the groove (under a high powered scope almost looks like gravel at the bottom of the groove). The groove walls have much smaller particles in the 50-200 nm (nanometer) range coating them. Could not find any evidence these particles were bonded to the PVC groove wall. US cleaning with a bit of surfactant will remove 95% of them.
US pressings from the 1980s and earlier usually have the highest particle load. Could not distinguish a major difference in particle loads between US pressing plants.
Japan pressings from King Record, Victor Music, Toshiba-EMI, RVC corp, and others usually have much less of a particle load than US pressings.
Of the Japan pressing plants, King Record Japan pressings were observed to have the fewest number of particles among the Japan pressing plants. All Japan pressings had particles that were smaller in size and less in quantity than those observed and measured in the US, UK, or the few Germany pressing observed (i.e. much easier to clean than typical US pressings).
As a side note, under high power, you can actually see the detrimental effects of the stamper polishing process some plants used to use on some of their tooling to reduce the number of pops and clicks; you can see it in the top edge of the groove walls.
With the help of several scientist friends, a series of cleaning experiments were run over a 6 month period trying to remove the particles intact. Several regular cleaning solutions were tried, experimental mixes were tried, and differences in times were tried. VAC machines and US machines were both used. I was really hoping a VAC machine would pull out the majority of particles since it would save me the costs of an US machine. That hope did not materialize. Each record was labeled with the experimental treatment, date and time. Would then take the records into the lab at work and look at the grooves pre and post cleaning treatments after work hours.
If a collector only has a vac machine all is not lost though. A collector can use a 10 min soak treatment with a surfactant solution keeping it wet for all 10 min (need to really level the surface the record sits on first in both X and Y planes). Then use the VAC machine to suck off the solution and the particles that have been removed from the groove and are floating in suspension in the cleaning solution.