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Well it was 6' long, 2' wide but only 2" deep not quite a sink hole but lots of umm gooey gravel, still seemed to annoy them :-) It also works well in a parts washer and cleaning concrete but don't let it soak on the concrete too long it will eat at it.

I used a product call Oil Eater from Costco to quickly strip 40 years of crud from the underside of one of my projects. Works great, biodegradable but I would caution you not to let it pool on asphalt, the city wasn't happy with the 2' by 6' hole it ate in their street in front of the house...