Does the record continue to sound so much better a week later? I wonder if the improvement is due to a 'softer' surface from water absorption, or perhaps due to a reduction of surface electrical charge (static), rather than the cleaning effect?
Home Experiment: Wash just 1/2 of the recording with 'Joy' (mark the half you wash) listen to it afterwards (digitally record it), and then a few weeks later listen/record when it is quite dry. Compare the recordings.
>>I took a copy of a record which suffers from this disease, NRISSTB,(no
>>reason it should sound this bad) and I cleaned it with one tiny drop of
>>dishwashing soap. I made sure to add ample water to it and cleaned it
>>visible residue was on the disc. I then cleaned the surface again with
>>a record cloth to remove any late arriving airborne residue. The results
>>have been really amazing.
>>Aaron (Don't try this at home kids) Levinson