Related: The 6 Best Caulk Guns Our Editors Recommend Choose Gray or Brown Caulk to Hide Grime "Darker caulk colors, such as gray and brown, are better at hiding grime and mold," Garvey says.

Choose Gray Caulk for Cool Tones "Cool-toned tiles, such as gray, blue, or green, look best with light or medium gray caulk," Garvey says.