parts washer fluid questions

I was raised on the original Gunk Hydro Seal. You could put a disassembled carb in it and in a couple of hours it was spotless. When it got older it might take several hours but still did an awesome job. When I was 16 i thought I would use some of the stuff to clean a Muncie 4sp. I put some in a glass and started cleaning it with a parts brush, after a while my index finger started burning, when I washed my hands off I had pin holes in my finger and it burned like hell!! I eventually recovered and all was well. Then along came the tree huggers and they came out with the new ans improved environmentally friendly Gunk Hydro Seal II, This crap is so lame you can soak your wood pecker in it all night. That is progress for you!!!