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You need to try and get the concrete off before it settles. You can try scraping it off with a razor blade.
Muriatic acid will remove concrete from marble. You can also sand it off. Using a scraper may also help to free it.
There are a few ways one can remove wood stain off of concrete. One way is to use a sandblaster to remove the stains. Another method is using wood bleach, water, and a scrubbing brush.
It is possible for curing concrete to produce VOCs, or volatile organic compounds, which contain harmful gases. This can happen if the concrete is cured using a toxic chemical compound. The toxicity of the gas has shown to wear off after 28 days.
smash it of with a sledge hammer
With a light solution of hydrochloric acid and water, let the solution soak in the concrete for a few minutes and then rinse it off.
Caterpillar excrement is an organic substances. Therefore, it can be removed from concrete using an organic solvent such as acetone.
Scrape off what u can with a razor blade. White vinegar should remove what's left.
Make a paste of Tide detergent and hot water. Scrub it into the concrete and let dry. Rinse off with a hose.This answer was emailed to me from ArmorAll customer service.
Check with your local hardware store or Home Depot/Lowes etc. There is a special chemical that is supposed to clean everything from concrete.
Removing color release powder from stamped concrete can be a very labor intensive process. It will involve using chemical stripper to take the sealant off the concrete. Then, using a bristle brush and a diluted acid, scrub the concrete as much as possible to remove the color release powder.
Try Goof Off , it removes many odd substances and will not harm auto finishes.