Choose a soy-based all-purpose stripper, which can be rinsed away outdoors without worry for the environment or groundwater.
Apply the stripper to all of the splattered stains. Paint on the stripper generously, or you may have to repeat this process.
Let the stripper sit for 30 minutes. Use a power washer filled with plain water to rinse the driveway. The loosened splattered material will peel away under the force of the water.
Scrape up any small remaining areas of paint or other substances, using the paint scraper. Use the scraper at a 45-degree angle to avoid gouging the concrete.