Most of my house is tiled and the grout which was white 10 years ago is now almost black. I mop every few days but it does nothing to the grout.

Would love to know if there is any miracle product or tool that can clean my grout? I don’t fancy spending hours upon hours scrubbing my whole house, but it’s the only way I know how? Would love any invaluable tricks or tools I could use. Thank you!