RE: Grease Stains
TSP is the kitty's behind for oil and grease removal. However the synthetic detergent in Joy is just as good in an application like this, and will actually help the water penetrate the concrete and perk the sub-surface grease better than TSP will. It also rinses more easily, and will not harm the landscape if you mix it too strong. Not so with TSP.
I would consider a final cleaning with a pressure washer if necessary.
EDIT: I also heartily endorse the Bigger Smoker Option :D
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qman
Para Bellum
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