First I should say hello again. For a few years I’ve been getting my 16 oz. bottles of LAST 2 from Music Direct in Chicago where it gets to me in 2 days. The exception being a few months ago when you had a brief sale and I got another LAST 2 even though I had plenty still here.
I am pretty convinced that I understand most of the hibernating crud problem. There are some unknowns, and some un-knowables that are part and parcel of the problem. And some answers come from 40 year old personal history.
Early in the life of the company, I was invited to make a presentation to a Meeting of a Southern California Society of Collectors. As part of the event, attendees were expected to visit the pressing plant for Capitol Records. It was a good gathering with sometimes spotty quality, but some robust papers were delivered and read in session. For myself, the entire event was paid for with the experience of visiting the record pressing plant and the knowledge gained there.
The plant was a re-purposed aircraft assembly structure. A huge open floor with areas marked off for different activities and functions.
The only “Clean Room” in this facility was a relatively small, covered, and walled of area where finished records were checked by hand and inserted into sleeves and envelopes. I mention this because the meeting was held in the summer in Los Angeles, and if the day became very warm, the huge doors on each end of the building were opened to allow cool breezes (and attendant DUST) to swirl into the work space. There were 4 or 5 fairly long rows of record pressing machines, each row having an operator that moved from one machine to the next one to extract a just-pressed record from the faces of the press, and placed it on a vertical spindle to allow the record to cool and maintain relative flatness. The cold water that was cooling the press faces was turned off and steam was admitted, heating the press faces for the next work piece.
A stream of vinyl pellets is fed into a heated auger along with a dollop of magic sauce. And this is the source of most of the problems that you are experiencing. Record producers were using different grades and qualities of vinyl. In general, European and Japanese plants used better grades and didn’t try to push production levels beyond what could be expected from the materials and technology available. One of the problems of the “Magic Sauce” (often a form or grade of Silicon lubricant) was that it was a proprietary secret, not to be disclosed to other firms. The auger produces a large biscuit sized puck of molten vinyl mixed with the “MS”. That puck is placed in the center of the press and hydraulic pressure (upwards of 70,000 #/square inch) is applied to close the press. The purpose of the MS was to insure two conditions, 1. a smooth continuous flow of heated vinyl from the center all the way to the outer edge of the press faces, with no bubbles, no voids, no cavities. AND, 2. an absolutely clean release from the stamper when the press is opened. No drips, drops, or leavings of any kind to screw up the next record, or 10 records!!!! BUT, before the press is opened (still at high clamping pressure), cold water is flushed in to cool the press and the work piece (the record). The record is frozen into its final state while still under pressure, meaning those internal lubricants are locked into microscopic cavities in the vinyl under pressure. (Not the very high clamping pressure, but still higher than ambient.)
I think that microscopic quantities of the Magic Sauce are escaping the confines of the vinyl body and creating the conditions for your anguish.
The records can and may be cleaned as you are doing. I would like to offer a suggestion of what I think, may be (ultimately) a solution with a longer reach (and possible) one that could expose and eliminate currently undiscovered new sites. We do not have an Audio Desk System Ultrasonic Record Cleaner, however I have received very good reports about how thoroughly and effectively they perform. I think the U.S. Distributor is ultra@UltraSystem.com Tel: (215) 862-6570 They should be able to steer you in the direction of any Dealer in the NJ/NY area that is relatively close to you. A cleaning operation on a couple of records should very quickly point to a solution (if Ultra-sonic cleaning offers one).
I realize this is a very long answer to your question. I also think that your question and attendant problem are entirely worthy of my response. Please keep me informed about any progress (or lack thereof).
With Warmest Regards,