@pindac,
For routine cleaning, you do not need to soak the record with White Distilled Vinegar for 15-30 minutes. That time comes from the book "VIII.12. DESCALING: Occasionally when resurrecting a Goodwill™ or flea market record find, there may be evidence of scale – such as hard water mineral spots...".
For routine cleaning - I only do 2-4 minutes. The following info is not yet in the book:
After a chance review of this thread
https://audiokarma.org/forums/index.php ... t-14577762 and while I question the validity of the source of the carbonates, it occurred to me that what I am seeing as ref PACVR 2nd Ed Chapter/para IV.6 & Figure 10 is very tightly adherent non-organic/mineral based particles. These type particles are natural to the environment; known as aerosols
https://earthobservatory.nasa.gov/globa ... 2_M_AER_RA. So its entirely feasible that these particle 'may' be in the ambient of record pressing factories (except QRP -
http://www.qualityrecordpressings.com/i ... =standards which appear pressed in a very clean environment); and can be essentially be pressed into the record. These type particles are not going to be easily removed.
Carbonates fluoresce intensely white and noting that I do inspect records with a 10 watt UV light, and it now occurred to me that the intense white specs that I am seeing on 'some' records may be inorganic salts/minerals. And, this debris that fluoresce intensely is not removed by multiple detergent washes and multiple rinses (with brush & flowing water). However, a weak acid can dissolve mineral type particles, especially very small (<5 microns) particles that can dissolve quickly. So after pre-clean with Alconox Liquinox I now do a pre-clean with White Distilled Vinegar (WDV) 5% acidity of which I add 4-5 drops Tergitol 15-S-9 to 1-pint WDV so that the WDV wets the record. I spray-on and gently agitate with Record Dr. nylon brush for 2-4 minutes. The results are good to excellent. WDV is unique - its a weak acid, its acetic acid that is fermented from ethanol and is also known as ethanolic acid and its very pure with almost no non-volatile residue (NVR); rinses easily and is cheap and readily available. After WDV pre-clean, I final clean and rinse.
Otherwise, good to hear you are getting good results.
Stay well,
Neil