[ARSCLIST] White haze on older LPs -- cure??

[Tom Fine <tflists@xxxxxxxxxxxxxxxxxxx>]

Hi All:

I have here a couple of mid-50's mono LPs, excellent condition as far as scratches and grit but they 
have that dull white-ish haze, which seems to make the vinyl hiss when it's played. Kind of like 
tape hiss, but less full-spectrum. Not swish-hiss, which seems to happen when this film doesn't 
uniformly cover the whole record surface. I think this white-gray substance might be leached out of 
plastic inner sleeves, but why only on one side of the records?  VPI fluid doesn't remove the 
substance but does remove any crud from the grooves because the records play beautifully except for 
the hiss -- not a single tick/pop and no groove crackle.

Any way to remove this or is it now part of the vinyl?

-- Tom Fine