IIRC, "Beano" is an enzyme.......
FWIW, home distillers ( moonshiners ) are reporting it being as effective as malt in converting ( hydrolizing ) complex starches into simple sugars.
Potatoes or corn, some yeast and "Beano", and you got yourself some mash....thinking this also works at a lower temperature than the amalyse ( sp ) too.
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Back to the oil--always seems to dissappear within a year or so from my gravel drive, and I find it hard to believe its all being washed away by the rain...
In fact, many municipalitys are now requiring a "grassy swale area" in order that any oily runoff from parking lots, subdivisions, and other such largely paved-over areas be allowed time in order to bio-process before the water leaches back into the soil in recharging the local aquifer.