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Haven't had call to use enameled copper wire in ages, but scraping with a knife blade is all I've ever needed to establish electrical conductivity. If you've also sanded, I wouldn't expect there to be any issues... At most, a dip and wipe with acetone (even drug store nail polish remover) should guarantee a clean surface to work with. If solder still has issue sticking, are you using sufficient flux (even basic rosin-cored electronic solder should be fine, I would think)? Are you twisting your joints together before soldering or just poking the ends into the puddle? I'm having trouble imagining why this wouldn't work, if there isn't some other issue at play...
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