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An ultra fine polishing compound like simichrome and a felt bob or maybe the steel wool thing. I myself use fine rubber abrasive tips hand shaped to fit down inside the mold at specific areas while the mold is closed and polish those areas.
You have to do this with the mold closed or you run the risk of rounding out the edges of the mold where its split.
Sometimes being extremly careful I can spot polish a bad area within the mold if theres a small nick or rough spot but you have to be very careful.
The square lube groove thing is a PIA as my first Lyman mold a .44 240gr SWC would not come out without beating the bullets out of the mold when I was handcasting. I sent the mold back and they replaced it with the lube grooves slightly angled to released.
Since that time I learned the meaning of a proper "draft angle" from the late Walt Mealander of NEI in the mold blocks to provide a proper release.
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