Copper Soldering

Copper Soldering (Plumbing Question)?
I’m replacing my water heater and the old cold water piping still has some solder on the end of it.
Do I need to cut this off or is ok to add flux and connect to it. I’ve been hitting it with steel wool to try and clean the end off but its taking forever.
This is all copper piping.
Take your torch and heat up the old solder, as it starts to flow wipe it with a thick old rag. You may have to do that a couple of times. Then clean the surface with sandpaper. Then you can basically treat it as new copper. Hope this helps you.
Plumbing – Soldering Copper Pipes
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