Quote:
Originally Posted by DAVES
Not defending the people you hired but oil on cement is virtually impossible to remove as it soaks into the porous cement. Detergent will thin the oil and remove some but allow the rest to soak in further. Traditional is muriatic acid. It is cheap and works. BEWARE, it is diluted HYDOCLORIC acid. Will like take several applications. As it will take several applications you will probably need to do it yourself. READ on the internet. Have proper equipment, eye protection proper gloves. Wash it into the street.
If, into your plants it will kill or damage them
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Excellent points. Pressure washing very seldom removes oil stains.
And too much muriatic acid can result in revealing the aggregate inside the concrete. Or so a friend told me
