"R D S" wrote in message
...
Hi,

I have ripped out my kitchen and the copper pipes in places have a green
powdery covering which I assume is some sort of oxidisation.

Should I clean this off and if so what with?

Its due to lazy plumbers not cleaning the flux off when doing the initial
installation. If you really want to you can clean it off with wire wool or
similar and give it a wipe with a dab of vaseline or similar.

HTH

John