G'day Widget,
Well, all I can say [as a field chemist with Baker Hughes in a past life, which included quite a lot of oilfield corrosion related work and training] is that there's far too much 'snake oil' in the blurbs for all of those products, for my liking.
And none of them have a readily downloadable MSDS available.
So for me, the bottom line is that they may well 'work like it says on the packet'. But their pricing is highly likely to be in the 'predatory' class, for what's actually in them...
