Having installed my underfloor heating system with thermal store, as this is
> a fully pressurised system had the store to boiler connections put in by a
> friend of the family who is Corgi registered.
>
> Noticed that all of his copper joints - water or gas ... have bright green
> verdigris (sp?) coating on them.
> What is the best way of cleaning this off - other than just plain old woolly > wire. >
> Is there anything that can be wiped on to prevent it coming back ? ... don't
> want to spray pipes with clear coat.
>
> I previously have always wiped joints before they cool - and not had this
> problem - but Corgi man he say no !
>
> Rick
Just been discussed in another thread but I can't find it just now! [Could even have been you] This is due to the flux used to clean the joint during soldering. 'Wiping whilst hot' is apparently a shooting offence. If the acid flux is cleaned off it should not come back (hopefully). I would assume that warm water and a mild detergent would shift it. Don't know if you have to neutralise it to prevent it coming back from traces. If so, presumably some weak alkali solution (although I suppose that could cause other problems) :-(
Spray with something like WD40 to clear any remaining water based solvents?
Or just polish every day with Brasso :-)
Hopefully someone has a tried and tested cure.
Cheers Dave R