This Zep Grout Cleaner Has 1,500+ Reviews on Home Depot

We updated this article in February 2023 to ensure all products tested and vetted by the Good Housekeeping Institute Cleaning Lab were in stock and reflected accurate pricing. We also added more expert advice on keeping your tile grout clean.

As much as we try to keep it clean, white grout inevitably gets dingy and discolored, especially in corners and along edges where water settles. That's why you need a good grout cleaner. Nothing provides a faster facelift for your bathroom than learning how to clean grout to restore its brilliant state, but it isn't always an easy task.

In the Good Housekeeping Institute Cleaning Lab, we test hundreds of floor-cleaning, bathroom-refreshing and stain-zapping products every year. Our experts have spent thousands of hours researching and testing everything you need in your cleaning toolkit to keep your home sparkling, from the best steam mops and vacuums to the top tools to clean toilets. It's difficult to replicate in the Lab the mildew, mold, soap scum and hard water stains we see at home, so we take each product home to clean our own grout. We assess how well the products clean and how easy they are to use; we also review the labels of all products for helpfulness and safety precautions.

Our top picks:

It's important to note that if you have mold growing on your grout, you will need to use a disinfectant cleaner (likely with bleach) to kill the mold spores and prevent them from reappearing. If that doesn't work, it may be time to call in the professionals for a deep cleaning and resealing of your grout. You can read more about how we test tile grout cleaners and find answers to some frequently asked questions at the end of this guide. Looking for more ways to keep floor tiles clean? Check out our guides to the best mops and the more hands-off robot mops.