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I have, all of them, not near 15k finish.

Lap the flattest side.

Just use the flat side, EBay Dragon Tongue/ Welsh Slates are no-where near 15k or even half that…

Get a 12k super stone, a good Thüringen, hard Ark, Translucent or Black.

If a stone is gummed from years of oil and swarf, oven cleaner will get the majority of surface oil off, soaking will remove the deep imbedded oil from the stone.

Heat and degreaser, thrift store...

Are you talking about Arks or real slate, American Stone brand?

Either way once cleaned, soaking in Simple Green or any degreasing cleaner, Smith’s works fine as does mineral oil. Once clean it...