If there is one tool that everyone living in Northern United States, Canada and mountainous regions has it's an ice scraper for your car's windshield. And if there is one thing we all have in common, it's the fact that long before the end of the winter, it no longer scrapes well. So just like with all scraping tools and spatulas, you can 'dress' it.
Simply get a good hold on the scraper, or put it in a vice, and run a smooth metal file over the edge until all the nicks are gone. You may have to shave a little off the top and a little off the face, but if you keep it sharp and flat, it will clean those windshields much faster. Which means, you get a cleaner, safer windshield, much faster. Don't have a file? You can do the same thing by using concrete steps as a file. It works slowly, but it works. Don't try dressing it on a grinding wheel, as the plastic will melt and clog up the grinding stone.