"William Sommerwerck" wrote in message
. ..
There is a conductive residue. A thorough washing with
de-ionized water is usually required.

Actually, de-ionized water isn't de-ionized. It actually has "hard" ions
replaced with "soft" ions.

I'm old enough to remember the Wantz "Kleensteam" ion-exchage-resin column
to make soft water for steam irons.




I'm old enough to remember my mum using the melt water from defrosting the
fridge.



Gareth.