On 28/03/2021 09:54, Brian Gaff (Sofa) wrote:
I really don't think something that close will be able to be cleaned and not
affect the next one if you get my drift. The copper will need to be hot to
clean it, but in the end it might all be better to replace rather than
expect a pipe that has been soldered to seal in a compression fitting.

I disagree.

When the pipe is hot enough it is quite straightforward to wipe the pipe
of any excess solder.

If the olive can go on the pipe, then sufficient solder has been
removed. It will bite through the thin film of solder and give a good
seal. That has been my experience.