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How to clean Stubborn Records

I've been having trouble with a few LPs that just don't want to come clean. I've been able to reduce the crackle and pop, but there is still a decent amount of it, along with constant surface noise. This may just indicate that the albums are worn out, but I hear no distortion in loud passages, nor is there a lack of dynamic range. To clean the albums, I first apply a solution of 1 part rubbing alcohol, 2 parts distilled water, with a few drops of detergent. I then use a paint brush to do a little scrubbing (the bristles have been cut down to about 1.5 inches long to enable scrubbing). After that, I put the LP on a dish rack vertically and rinse off with steam. I repeat for the other side, then put it through my Spin-Clean unit to remove any left over residue. The record is then lightly wiped, then air dried.

Are there any suggestions here to help me remove even more of the crack and pop? The method I described does clear up sound clarity in the higher frequencies, but it seems like there is still dirt on the record, as if the cleaning process loosened the dirt, but didn't fully remove it. Would a vacuum dramatically improve this?
jwglista
nanotweeter
55 posts
 
It would be helpful if it were possible to visually inspect the groves before and after cleaning. Has anyone tried something like a 10x or 25x Radio Shack pocket microscope (or another type) and would that even be enough magnification to see anything?

Regards,

John
oregon
826 posts
 
It may well be the vinyl is "worn". I have tried cleaning some records using dish soap/water, then on my N. Gritty with Audio Intelligent solution. Still I could not reduce the surface noise.
2 LPs were especially heartbreaking- original pressing of Dylans and an early pressing of Robert Johnson. Both looked clean and pristine to the naked eye.
One day i took them and another (excellent sounding) Lp to work. I looked at them through 3 very powerful microscopes (used for neurosurgery). On the noisy Lps, the grooves were marked with vertical "cuts". It looked as if a sharp knife made shallow cuts every millimeter. Of course, these individual cuts are much closer in proximity to each other. These cuts were everywhere on the LP. The clean sounding Lp was smooth, no marks.
My guess is a damaged stylus is to blame.
Of course, this cannot be "cleaned". Some LPs are simply ruined.
nanotweeter
55 posts
 
Oregon,

Very interesting observation. What magnification did it take to see the detail you described. Thanks.

Regards,

John
oregon
826 posts
 
Nano,
Either 300 or 400.
Leica optics.

Again, it looked like cuts made by a knife, on both walls of the groove, in even intervals. My only explanation is that a stylus which was broken, or chipped, perhaps, or, completely broken off the tip of the cantilever and that the cantilever tip created the marks, or cuts.
kenyonbm
141 posts
 
I have observed, on what otherwise seem all but perfect records, a uniform pattern of tiny radial cracks on both sides.

My theory is that these are shrinkage cracks along flow lines and between flow zones from the pressing. If the puck of vinyl was not blended sufficiently or the record not "cooked" in the press long enough to completely melt adjacent zones it might crack this way as it cools.

PVC has a relatively high coefficient of expansion.

Further, perhaps these records are superficially in good condition because they where unlistenable or even returned as defective.

Oregon, are the "cuts" you describe on both sides of the record? I would take that a supporting this explanation.

Ken
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