30ml of garlic extract: https://www.ncbi.nlm.nih.gov/pubmed/6471129
Actual cloves do consist of more solid pod than liquid oil, so it would take a lot of more garlic.
idk, but hey i found a thing on the internet so it must be true - http://boards.straightdope.com/sdmb/showthread.php?t=533902
Welcome back to Cody's Lab, today we'll be testing the corrosive properties of garlic farts...