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Try Goof Off , it removes many odd substances and will not harm auto finishes.
Baking soda is the best way to remove acid stains from concrete. Dawn may remove grease stains from concrete. Vinegar is another great solvent for grease stains.
It depends. If the air and ground are warm, it might only be 2 or 3 hours before the forms are stripped. If a high-early-strength admixture is in the concrete mix, the forms could likely be remove at around an hour after placing it. This could result in stress cracks in the placed concrete, however. On the other hand, forms hold water inside the concrete where it is critically needed for the mix to cure and harden. If forms are stripped in the first 3 days or so since placing the concrete mix, then other means must be used to keep the water in the mix. A spray coat of latex liquid (Curing compound) can do it. A sprinkler running 24 hours per day can do it (This is the best way), or a covering of plastic sheeting can do it. Some people still use large burlap blankets soaked in water to cover the concrete.
You would have to cut it out with a blade or cable.
Muriatic acid will remove concrete from marble. You can also sand it off. Using a scraper may also help to free it.
WD-40 will remove pine sap from a car's finish without causing damage to the car.
Use detergent
24hours with concrete grade 35
If you let the concrete dry on the ceramic, they have bonded. You can try to chisel it loose.
Scratches can be removed from concrete by sanding them. They can also be removed by applying a thin scratch coat.
steel wool and a polishing stone. But, why would you remove the black finish?
concrete is usally free to dump i would use pick up take it to a concrete recycle Depending on where you are located, you can obtain a dumpster to rent that can be placed on the job site or the property to remove the concrete. The pricing, sizing, and removal information will vary depending on your location. Unfortunatly that is not listed within the question so I am unable tp provide you with more concrete (no pun intended) information. i have about 4 yaard of concrete to remove,i need o quote on a dumpster.