It was actual grease
@coffeeandcake I wiped a blob on my finger to be sure. Squeaky? clean grease.
Anyhoo, lacking some other more specialist cleaners......I blasted some brake disc cleaner in there along with some aerosol oil and got it clean. It's not perfect but it'll do for now. It's just ingrained muck for now but I'll get that done properly soon.
The stuff that came out of there though...I could stuff a teddy bear with it!
There's a blob of sewing machine oil in there now.
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