Drbond, if a “sealed, mint” LP does not respond to the cleaning you’ve already done, I’d give up and either toss those LPs or tolerate them as is. I doubt any further cleaning will fix them. Good money after bad, and all that.
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Sorry for being so pedantic, but first of all ALL enzymes are proteins, not just most of them or some of them. In general, enzymes act to catalyze chemical reactions that would happen anyway but happen much faster if mediated by an enzyme. (That's actually the definition of a catalyst; it moves the reaction forward.) With that in mind, I wondered why enzymatic activity would be beneficial for cleaning an LP. My guess is that enzymatic cleaners help to break down large possibly insoluble molecules, possibly precipitates that are by definition insoluble, into smaller more soluble molecules, which can then be either dissolved (in water, alcohol, and or with the help of nonionic detergent) and washed away. What exactly are the substrates for enzymes that one can find in an LP groove, I do not know.
This is what I specifically stated in the book, and I stand corrected on 'generally some kind"
VIII.9 ENZYMES. Enzymes are biological catalysts that are generally some kind of protein. There is the “lock & key” analogy associated with enzymes and cleaning. The particular enzyme must be the right key to unlock (dissolving) the particular soil. There are four (4) basic enzymes used and how each works can be contaminant, time, concentration and surface dependent, and they have to be rinsed.
The enzymes can be irritating to some individuals. Per Guidance for the Risk
If you review the ingredient list of a quality laundry detergent such as Tide - CPID (whatsinproducts.com) you will see various enzymes - good for blood, urine and grass stains. What does this all have to do with cleaning a record - well unless someone bled on it, used it as bathroom, had sex on it or used it as a frizz-bee, not much that I can see.
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