In the process of [replacing a radiator](https://diy.stackexchange.com/q/132322/1300) and there is a fair amount of corrosion around the connections.

[![enter image description here](https://i.stack.imgur.com/SQitj.jpg)](https://i.stack.imgur.com/SQitj.jpg)
[![enter image description here](https://i.stack.imgur.com/1N316.jpg)](https://i.stack.imgur.com/1N316.jpg)

I plan on scrubbing as much off as I can with sandpaper or steel wool, but is there a recommended way to clear corrosion here? Or does it even matter that much if I can tighten the fittings up enough and use PTFE tape?