Try to remove concrete splash while it's still wet and easiest to clean off. To clean up dried concrete, gather together soap, water, a non-abrasive sponge and a blade for scraping, such as a paint scraper or putty knife. Thick, dried-on splash may require a commercially available concrete solvent. Don't use acid-based solvents.Continue Reading
Begin by spraying the splash with a hose to remove any concrete bits that are still wet. Use an appropriate water pressure for the affected material, using a softer spray on more fragile areas, such as wood or vinyl siding, and a stronger spray for hardier materials, such as glass or cars.
Soften the remaining concrete with a water soaked sponge that won't damage the underlying material.
Combine dish soap and water in a spray bottle and spray the concrete.
With a scraper or knife, begin scraping away at the concrete. Be careful not to scratch or damage the underlying surface.
For any remaining concrete, apply a commercial solvent, such as Cretewash or Cemix, according to manufacturer instructions. Allow it to sit and absorb into the concrete, and then scrub or scrape away all the concrete.