I have an old and valuable LP that has a few clicks and pops. I can actually see some of the grime pasted on to the record (which I've tried to clean). I've tried cleaning it off with Mobile Fidelity Super Deep Cleaner as well as the Mobile Fidelity Enzymatic Cleaner, followed by a vacuum on the Nitty Gritty using its fluid, but no luck. This is a valuable record so I don't want to get too physical.
Any ideas? What's the best cleaner out there for this kind of visible, baked on dirt? Thank you.