[Smurf]

Like I mentioned before why not also give the mad Frenchman a call at algoclear as has been in this game a very long time.  http://www.renderclean.biz/index.html

[trafficjamz]

Putting these photos in the correct thread - sorry.
So these are the after effects of another guy applying hypo to the render of a neighbour's house.

As for the stained rusty looking lead flashing, is that a natural reaction to hypo? Or was it not diluted enough?
And the white residue and seemingly etched into the electric meter door, could that be a too strong mix and/or not rinsed enough?