He's saying you should use sandpaper to get rid of the gunk from the tip.
Most cheap tips have a copper core, which will sand/file just fine. Once the gunk is gone, heat it up, flux it, tin it, and wipe it with a moist sponge/cloth.
If you have some expensive alloy-tip, the sanding may wreck it, but it sounds like it's already wrecked.
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