The drain cleaning products that contain concentrated sulfuric acid work like magic on sinks stained with ferric chloride. Just put some on a damp sponge, wipe and rinse.
Baxter
--- In Homebrew_PCBs@yahoogroups.com, lists <Stuartlists@...> wrote:
>
> 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
>