My concrete driveway has a fairly large (5') oil stain, several years old.
I have been reading claims on the net for various ways to clean it, and tried several, including big box store's "Driveway Cleaner". So far, no luck.
Anyone have success doing this? Would one of the 'commerial' cleaners, like this one:
actually work? At $30 gal it's worth it if it works, but another pricey experiment if it doesn't.
Or is it just not possible to remove old stains?