Q: How should I clean the slate in front of my house without damaging the mortar or grout? A: Marble and limestone are in one big group of natural stones, those made up mostly of calcium carbonate.

Unlike homemade laundry detergent, DIY stain removers are a good—and sometimes the best—choice for stubborn stains.

Save this article to read it later. Find this story in your account’s ‘Saved for Later’ section. As both a professional dry cleaner and proud laundry nerd, I’ve spent the past four years testing ...