You can try the same thing i tried. 20 years ago, i dumped a gallon of feric cloride solution outside on the ground. the end result was the ground becoming a complete wasteland for 10 years and THEN only weeds came in for the next 5 years until grasses started to come back. You can treat this as a good case of long term herbicides. it even got rid of that dreaded rose fungus that's always been in the ground right there. it may not be approved by the government but now they cannot even detect it's been done and the rain/snow deposited an inch of extra soil on top of what's already been there.
as far as etching aluminum, try the chemical "phosphoric acid". we use that at work to etch and clean all metals but have to be careful around aluminum and pot metals because it tends to completely dissolve them if left too long. yes, that too has a herbicidal effect, especially on poison ivy.
