What do you do when nothing seems to get LP clean?


What do you do when nothing else seems to work? I have scrubbed with disc doctor brushes; used VPI fiber brush; tried multiple washings and nothing seems to get out this visible "gunk". Whatever it is, I've noticed it on a number of used LPs that I've tried to rescue. Its not raised, but just seems to have "attached" itself to the vinyl. Is it mold? I know its hard to know what exactly I'm dealing with without being able to see it, but what do you use as a last resort, when nothing else seems to do the trick?
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Cello:
Would I be well advised then to reserve Premiere for a one time application to new LPs and stay with whatever solution I find best works for removing dust, dirt, debris from older records?
Just when are these nefarious enzymes supposed to do their dirty work? I keep looking at and playing the records I've cleaned over the past couple of months with Paul's stuff and all I see is shine and all I hear is quiet grooves and wonderful clarity. Are these discs going to enzyme hell sometime soon? Inquiring minds want to know. :-)
Geez, how is an enzyme supposed to live if it is washed off and vacuumed away AND the environment to support such life is removed?
Stewart,

All I use the Premiere for is a one-time shot on new records, unless I shoot it on an old album I'm not sure will clean. Then I give it a shot and see how the album LOOKS. If it looks like it's worth cleaning after the spray, I clean & play.

So, to answer to question to Cello, yes.
I don't know, Dopogue. When do "living cells" quit eating? I remember 4yanx mentioning that he found that most plasticizers were fat based.

"Are these discs going to enzyme hell soon?"

It's hard telling. My Armor All'ed CD's looked and sounded great for the first several years, then became unplayable. A couple of months? It appears that you've placed as much study and research as anyone else.