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Based solely on the picture (I can't feel it- that can tell you a lot.), I'd say wipe it down with brake cleaner and white paper towels until the paper towel comes back white, then send it.
I've always used a flat Norton honing brick. We used them extensively in the Toolroom/Machine shop. They are excellent. If your so inclined, I'd call Grainger, or McMaster-Carr, and see if they have any in stock (Damn Covid!!). Generally, these stones have a tan side and a black side, with tan being the finer abrasive, and black the courser abrasive. Use a bit of fuel oil/kerosene so they don't "load up" with gunk and fine metallic fragments. You can clean them by using them on any metal surface, wetted with fuel oil/kerosene. Hope this helps.......
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Preparing for new head gasket 
). Generally, these stones have a tan side and a black side, with tan being the finer abrasive, and black the courser abrasive. Use a bit of fuel oil/kerosene so they don't "load up" with gunk and fine metallic fragments. You can clean them by using them on any metal surface, wetted with fuel oil/kerosene. Hope this helps.......
