Dirt. I have it on vinyl. I'm not talking about the classic Alice In Chains album, although I do have that record. No, I'm talking about literal filth in my grooves, some of which may well have accrued for 40 years.
Now obviously over the years I've 'cleaned' my records – meticulously (but admittedly only occasionally) wiping with cloths and sprays to get rid of dust, hairs and fingermarks from the surface of records. I've held them up to the light to check their cleanliness relative to before, then put them back on the turntable and assumed it was the best that could be done.
