Homebrew PCBs

In article <4D40D94B.1080709@...>,
   Philip Pemberton <ygroups@...> wrote:

> JohnsonDiversey "Titan Sanitiser" works a treat for getting rid of FeCl 
> stains. Rinse the sink out to dampen it, turn off the tap and count to 
> ten. Cover the inside of the sink in the stuff (it's a powder) and rub 
> it on the stains. Rinse away the remaining powder (it's water soluble).

Proprietry "Ferric Chloride stain remeover" is based on Oxalic acid.

-- 
Stuart Winsor

Midland RISC OS show - Sat July 9th 2011