Homebrew PCBs

bebx2000 wrote:

> Quite by accident, I recently discovered that an acidic super drain
> cleaner composed mainly of sulfuric acid cleans the FeCl3 stains on
> hard surfaces almost instantly. The MSDS on these products lists the
> sulfuric acid content at approximately 90+%. Obviously, they are not
> to be used on fabrics.

Once i didn't had more oxalic acid around and i diluted hydrochloric
acid in water, tested in a non visible part of the shirt and them
removed the FeCl3 splashes with the solution. But in another piece of
cloth it altered the colors like bleach. On floor i have only used HCl,
its easier to get.

I guess that any acidic solution will work. Oxalic acid seems just handy
because is a dry powder weak acid and is common available.