Why do mint-looking LPs sometimes play poorly?


I've purchased some older Japanese vinyl (e.g., pro-use LPs) and some older half-speed vinyl pressings (e.g., cbs mastersound) and on a few occasions, although they have *looked* perfect under very bright light, they play with quite a bit of surface noise. The LPs are not warped, and the surface noise persists after a thorough cleaning. Any insights or recommendations? Thanks!
schuyler1976

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Probably the original owner wasn't an audiophile and played it with wrong settings, too much VTF etc.
or
it was cleaned with RCM fluid which changed the structure of the vinyl. Vinyl from Japan is generally the very best when new.