Hi Douglas,
When I am faced with rust like this I use a brass or even a steel brush with oil to start with. Then from your local DIY store an assorted pack of abrasive paper for metal surfaces. Using finger tips, folded pieces of paper and lots of oil go through the grades. Also large lumps of course steel wool to get in awkward places or clean round sections. Wipe clean regularly to check on the progress. It is easy to work on small stubborn spots in circular movements. The end finish is up to you. In a couple of hours of careful work you should end up with a clean but old looking surface, there may still be dark stains on the blade but this is what I want to see and like. At the end I give the blade a good rubbing or polishing with the fine steel wool and shoe wax. Your spear does look a bit scary but I think a Saturday morning or afternoons work on this will end up with a nice looking spear that somebody would pay good money for. There is no real substitute for hard dirty and most often painful work. If the blade does not cut you, pieces of steel wool get into your fingers. Show us the before and after pics.
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